As Ordeaux26 mentioned, it is mainly only 3-4 of the same Bayo players getting top 8. While ZeRo disappearing is a factor, it also comes to their skill as well, especially in a metagame where more and more people are figuring out how to (effectively) escape her death combos and abuse her meh ground game.
These are characters in B and C Tier to go over.
Doing very well. I entered Smashboards about four months ago, I can predict everyone's reaction to when Corrin is ranked 13th in the 3rd official tier list. However, Cosmos would prove that Corrin deserves that placement by scoring very high on tournaments. Fortunately for Corrin, he pushed this success to 2018 as well, consistently placing top 10 in each major he participates. Other Corrin players are playing very commendably in other areas of play as well. Other his representation is lower than other top/high tier characters, he competes with Marth and Ryu in terms of tier placement, and him being either at the top of high tier or the bottom of top tier is a wide topic of debate.
Solo Lucina is kinda rare for a character in her tier. She has more counterpick value than Marth, as she has a lower learning curve. As a result, she is seen as a very flexible counterpick character at high level play due to her similarities to Marth. Mr. E, among other Lucina mains, brings commandable results with this character to affirm her high tier placement. Although top players are using her less often in tournament play as a secondary so far in 2018, Mr. E continues to bring good results with the character, but not as good as the top 13. The only way she can be top tier with these results is if players think she is THAT similar to Marth (although not). Nevertheless, this tier position seems accurate and she keeps a close gap to her stronger ancestor.
This tier placement definitely brought debates thanks to AC's and MKLeo's success with MK as 2017 closes out. However, Pikachu seems to prove more and more that he deserves this 15th placement this year. Pikachu is a rare character in competitive play (which may lead to matchup inexperience) for being a high tier character, but ESAM brings out the thunder stronger this year, with a 7th placement on Genesis 5 and 3rd placement on EGLX 2018, with players like Rideae and Captain L giving out more consistent results regionally, and a few notable results in majors like Captain L's 13th placement on SML: Battle for Vegas. With this tier placement in tact, it is unknown if Pikachu will rise any further in the tier list due to still remaining rare.
MK's end of 2017 success didn't fully translate in 2018. MKLeo uses MK in more rarer occasions. Fortunately, he is still popular in a regional level, and still getting commendable results in a national level, with AC's 9th placement in EVO Japan being a good example. Despite MK's success and popularity, he competes with Captain Falcon, Peach, and Luigi for this spot, as they are rarer than him, yet obtains greater peaks that him in recent times. Time will tell.
Lucario is not doing too good backing up his 17th placement in 2018. Although he still gets a few good showings, such as Tsu- at Niconico Tokaigi
2018, he doesn't have too big of an impact in 2018 as he did in 2017 (aka Frostbite and West Side). His inconsistent playstyle, combined with the increased success of Captain Falcon, Peach, and Luigi makes things look bleak for him so far.
When we think of Luigi's successes, we think of Elegant in the end of 2017. In 2018, while Elegant continues to perform to (for the most part) dominate in regionals and locals, he struggles to achieve the peaks and wins in 2018 so far. While the increased successes of other Luigi players such Mr. ConCon and Poke in regionals does not make this a huge deal, the more consistent peaks and successes of Captain Falcon and Peach makes Luigi placing volatile. Nevertheless, his top 20 placement is secure for the time being.
Falcon is going off strong this year. Although he is a popular character (which puts emphasis on him being a high tier character), his results are nothing short of excellent. Fatality, although he struggles to make his Civil War impact, is performing amazing, getting consistent top 10 placements in tournaments for a high tier character. Due to that, things are looking bright for this character which may cause an increase in the future.
Peach, despite not being too common at all, is performing very well this year. This is especially credited to Samsora, for his high placements in both major and regional tournaments, and winning against opponents that Peach normally struggles with on paper. Other Peach players, especially in Japan, are pulling off good results for the character as well in a regional and sometimes even in major events (like MuteAce getting 25th at Frostbite). This combined with Lucario and Luigi lacking the peaks that she has makes this look only at her favor.
Olimar is somewhat struggling in comparison to 2017, but this is mainly thanks to Shuton's lack of attendance in US events. While Olimar still has a good playerbase getting results in regionals, those results specifically are not as strong as characters ranked below him such as Toon Link and Ness. With Shuton attending Switchfest and still getting good results in Japan, this may bring some positive gifts to Olimar, but until then, he is struggling off right now.
Both of these characters are not doing well, especially in comparison to 2017. Bowser's results and attendance, although respectable, have gone down. Nairo barely, if not at all, uses Bowser anymore at tournament play, while his mains have continued to bring only average results for the character. DK's solo results have gone down. His big issues with his matchup spread (which also applies to Bowser) are getting more abused in the current meta which led to his decrease in results, which includes his solo results. Recently, however, HIKARU managed to win Sumabato 24 and Konga got 17th at SML: Battle for Vegas may show that DK's flame hasn't been put out yet, but the increased results of Toon Link, Ness, Mega Man, and Greninja may haunt him as he struggles to get his glory back.
Toon Link is looking pretty well lately. His strong point is his results in Japan, as Sigma and Ri-ma brings out consistently good results in Japan, which includes both of them getting 9th at EVO Japan. Outside of Japan, he obtains above average placings at tournaments, which is more prevalent in regionals thanks to 3xA and Biddy in USA, and Hyuga in Mexico. The ultimate test for Toon Link, however, is Hyrule Saga.
An unfortunate victim of losing a top player crashing and burning the character, which is combined with DLC introducing characters that dealt with him easier. Despite achieving no where near the consistent strong results he once had, Villager's other players still get above average results with the character, especially at a regional level, thanks to SS, Panda Bair, and Aardvark. With a power shift in the C tier itself happening as a result of changes in 2018, it is unknown how it will affect Villager's placing.
Greninja already established itself as a solid character. His most solid results come from Europe, as IStudying continues to obtain solid results there, while other Greninja players such as Stroder and Some (in their respective regions) bring upon above average results. Similar to Villager, the power shift in the C Tier may make his future tier placement unpredictable, but he these results may cause a rise in the future.
Mega Man is a tricky character to place where he is in the current metagame. In one hand, we have Kameme getting 3rd at EVO Japan mostly using him, while getting consistent good results at Japan, but in the other hand, his popularity has gone down. While his results remain above average, it is tricky to place where he is due to these factors. It is mainly a factor of waiting (especially with Kameme participating in Switchfest) to see his true place in the meta.
Ness continues to defy the negative opinions laid upon him, and place consistent above average results. The main contributors to this are Gackt, BestNess, taranito, and S1 earning notable results in their regions and even in some major tournaments such as BestNess getting 25th at Genesis 5, S1 placing 5th at Midwest Mayhem 11, taranito placing 17th at EVO Japan, and Gackt placing 2nd at Frostbite Ursa Major 2, with numerous notable names taken off. This, combined with other Ness player's (such as Shaky and Awestin) great consistent regional results, the fall of Lucas opinion, and FOW's return to the scene (again lol) allowed Ness's overall opinion to rise, which may see a rise in the future.
Not doing very good at all, especially being placed this high. Despite numerous characters in D tier getting notably better results than him, public opinion of him is very persistent thanks to Taiheita's "potential" to do extremely well if traveled to USA (despite inconsistent results at the latter half of 2017) and "potential" as a character, resulting in him rising to 29th. However, one of the main factors behind Lucas's "potential", Taiheita, retired in competitive play in 2018, which dropped off Lucas pretty hard to only getting respectable results in certain regions and especially in local play, since he is the figurehead of Lucas's results. Unless public opinion is still persistent (which is like Yoshi's, but on steroids in terms of durability lol), he is very likely to drop off the record.
Next time, I am doing just a single tier (OMG this took a while to put together). Switchfest and Hyrule Saga is going to be the warren of many character's placements (for Switchfest: Mega Man's and Shulk's) (for Hyrule Saga: Sheik's, Toon Link's, and Link's).