Sadly, this comic is a prescient, accurate summary of the Ultimate general:
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Too true. A lot of echo chambers too. Gets really dumb and annoying sometimes. As well as some of the half-assed arguments to justify a character being a "lock" compared to "has a pretty good chance". Best example would be Isabelle. She was always likely, but there many valid arguments why she might not be in. In the end, the only real thing that made her possible was Villager being in first, due to the semi-clone thing. There was not enough time for her to be unique beyond that(and Sakurai did not make extra time for anyone either, so he wasn't going to delay it for her either, really. Not when he had a perfect representative in Villager for the game in general, who already was more than enough. Isabelle's a bonus, not a necessity, at this point), and even if she could be an Echo, it wouldn't matter unless Villager was there first. That pretty much sealed her being in, Villager being in first.
Being an all-star won't get you in. It'll get you considered. Her characterization made her an odd choice for a fighting game, but Amiibo Festival had an official personality of her being fine with competition, fixing that problem. It's not like her being in non-canon appearances could remotely matter anyway(lol at Mario Kart and Monster Hunter. They aren't her official personality. They aren't reasons why she should be in Smash. They don't represent her inherently at all. Only one game besides New Leaf did, and it was also an AC game. We even have her hammer from Amiibo Festival, showing its influence). So she was more of a lucky addition if you look at the information of how she could even get in.
Another is the foolish idea that Brave cannot mean anyone but Erdrick, using Jack as some elite example of it being Joker due to "one" thing. Pakkun Flower for Piranha Plant is another thing as well. Trying to interpret it as one possibility doesn't make sense. PP already was pretty much the literal name of the character, and that has nothing to do with the codename of Jack and how it relates to Joker(which there's 3 ways it can tie to Joker). Basically, for Brave, the important thing is that it should heavily relate to a character. Agumon, for instance, is the epitome of Brave. There's no stretch to say it could refer to him. Just like it could refer to a Dragon Quest character due to the Uuusha thing(did I spell that word right?). The only thing going for Erdrick is that he's heard among quite a few leakers, so he's more in the spotlight. Doesn't mean Brave can only somehow refer to DQ as is. I do think it might be a stretch to say it could mean any kind of person, like Banjo or Geno. It doesn't really relate to them at all.
To clarify for Jack, it could mean Jack Frost, Jack Playing Card, or Jack Of All Trades, which all reference the character Joker in some way. In a twist, it could also be someone entirely different that relates to it(one such case is, in a twist, Brian's official Japanese and Beta name as well, Jack. Of course, he's too obscure and there's no way he's getting in unless his series gets revived, and I don't think he'd get in even then, so he's off the table for what it could refer to due to common sense). But you could think of other names related to Jack. It just fits well for Joker enough that we can guess it refers to him. Though keep in mind we cannot confirm Joker and Jack are the same thing either. Just like we have no clue what Brave means.
Sorry for the rant, but needed to get it off my chest.
Now as for Agumon, one point to bring up is that while Brave could easily refer to him(and it makes a lot of sense), one wonders why the other slots don't have anything in them. Agumon will have Digivolutions, and each one would have its own character slot(just like unique costumes do, as well as every playable character, and obviously any NPC that is treated like a character, I.E. Master Hand). A theory I don't hold much is that Brave was removed because more work was done involving other slots. I will note, however, that even Brave is a general DQ Hero, every costume could be highly unique and have their own character slot too. This would explain its removal, for the same reason as why removing it so they can work on the Digivolutions without leaking it. Of course, I more believe it was removed because people datamined it and spread the information like wildfire.