Wolf is still a villain in his first appearance, and only goes anti-hero in later games. Not much different from Bowser. And yes, he's on par with them in Smash entirely. No exaggeration whatsoever.
It's a huge exaggeration because Wolf wasn't even the main villain in Star Fox 64, Andross was, and, again, the fight with him is technically optional. Again, Bowser has been a major character in almost every major Mario game since the beginning which means that he has well over 100 appearances in the franchise while Wolf's appearance sit at three games and 60% of the overall franchise. It's not even comparable. Saying Wolf is on the same level as Bowser is like saying Kamek or Birdo are too.
No. Falco is nowhere near Luigi's status. He'd have to have his own game to be close to that. He's just another guy. Wolf is far more creative in his moveset than Falco ever was. He's an original character.
Falco isn't near Luigi's status but that wasn't the point I was trying to make. Both Falco and Wolf are semiclones of Fox but Falco's similarities with Fox make a whole lot more sense than Wolf's. In Smash, as I pointed out, Wolf is essentially inverted Fox kind of like how Captain Falcon and Ganondorf were made to be opposites of each other. The situation, however, is not the same because 1. Ganondorf is basically Nintendo's second most important villain and significantly more important than the person he rips off in Smash and 2. they're from two completely different franchises. If Ganondorf had wound up as Black Shadow, we'd have the same issue as Fox and Wolf: two characters from the same franchise made to basically be opposites of each other but that is not the case. It's not as ostentatious as Link to Dark Link or Sonic to Shadow but it's still far from subtle.
They gave him an original moveset. Plain and simple. And that "eyepatch" and such is his original design anyway. It has nothing to do with Sakurai at that point. He just went with what was available at the time. Wolf literally had very little original design before Melee, so he had little choice.
Again, it's not totally original. He's basically Fox's opposite in almost every regard, right down to how he moves.
I call bull**** on Wolf being an afterthought. I don't buy in any way he wasn't planned for the game. Not for the SSE, obviously, but the game itself, I highly doubt he wasn't there already. I don't believe at all the order of the data has any relevance whatsoever and never have and never will. It's completely irrelevant to me.
Animation takes a long, long time to make. Even things that are a few minutes long can take months to make, even when done by professionals. Considering Falco was in 10 cutscenes compared to Wolf's 1, that means a lot more planning went into Falco's inclusion in Brawl than Wolf. It also doesn't help Wolf's case that it's estimated that the SSE took up roughly 3/5ths of the overall development time with him winding up as an after story side quest.
The only reason Falco was chosen over Mewtwo is because we had 6 Pokemon without Mewtwo. We'd have only half that for StarFox. Sakurai cutting any SF characters over Pokemon characters(which already has twice as much as SF in Melee too) makes no sense. Mewtwo had nothing going for it whatsoever to return. It had to face off against the Original 12's two Pokemon, who had seniority and 4 new Pokemon. Fact of the matter is, there's tons of Pokemon. Some being left out was expected, and Pichu and Mewtwo just weren't that relevant or important. Also, Falco was still currently a regular playable character in the SF games during Brawl's development. It made sense he came back after Mewtwo, who only had Gen 1 and the remakes going for it. It didn't have a single recent movie. Being popular alone wasn't going to help Mewtwo at all, as it brought nothing new to the table compared to Lucario, Pokemon Trainer(and all 3 Pokemon), and wasn't in 64 either, something that is quite important that we can tell.
Mewtwo was a whole lot more relevant, important, and popular than Jigglypuff at the time, especially with Gen One being remade only a few years before Brawl was announced. Even with Jigglypuff being part of the original 12, there's a lot that shows that, like Wolf, she sat on the razor's edge too and was added fairly late.
Command is also the least popular. Adventures is nice and all, and why he easily got back into Brawl. Also, the medals thing really doesn't make Falco anything special at all, since Peppy and Slippy still did way more overall(especially before Brawl). The only thing Falco could bring by the time of Melee was just being a clone. He wasn't good enough to be an original character or even a partial clone. Only Wolf got that, and that's because he isn't just like Fox in the games either. He has a different ship, different stats in Assault as well. There's a reason for that; Other than their looks, they weren't meant to be alike much at all.
As you said earlier, Roy and Ganondorf were clones too despite being major characters so it was hardly as damning of a factor as you make it out to be. The fact that Falco was one of the two clones that was spared from being outright cut from Brawl adds to this too.
Easily with Wolf gone. Clones have been whined about for ages, and Wolf managed to not be a carbon copy of Fox from the start in Smash. Falco is not even close to nearly as significant until after Melee itself, notably. And in only two of the many games he appears in. Wolf was always a notable enemy of Fox(since his debut, of course), and was even meant to appear in the first game itself, not just 64.
Brawl had no true clones, only semiclones: Lucas, Ganondorf, Luigi, Falco, Wolf, and Toon Link. It doesn't matter that Falco was more cloneish in Melee because 1. they bothered to keep him in Brawl unlike Pichu, Doc, Roy, and Young Link and 2. they adjusted him to be even less like Fox, just like Ganondorf was made to be less like Captain Falcon and Toon Link less than Young Link and thus in turn like Link.
Also, on the topic of Wolf's overall antagonist roles:
"Just what I needed to see. Star Wolf..."- Fox, Star Fox 64.
Even in game Fox sees Team Star Wolf as more of an annoyance than a serious threat so it's still a bit of stretch to call Wolf a major villain.
I expect both Falco and Wolf to appear, but I still completely doubt Falco would stay if one had to be cut. With the exception of Mewtwo, and possibly Squirtle, and Ivysaur(and notably this only applies to Pokemon), Sakurai has thrown out clones over originals every time. No matter their significance.
Neither Falco or Wolf are completely original but Falco has history both in Smash and Star Fox and has rolled off the chopping block once already. With Lucas and Wolf being the only not completely original new additions in Brawl, using your argument, they would be more likely to be cut but, even compared to Lucas, Wolf still has significantly less going for him. Lucas was in the starting roster while Wolf was unlockable. Lucas stars in his own game, Wolf doesn't. Being a reincarnation of Ness, his similarities with Ness make more sense than Wolf's similarities with Fox. Lucas was a big character in the SSE and arguably the only character that had any real character development while Wolf was an after the credits secret. The list goes on so, aside from Snake whose inclusion relies entirely on Konami's cooperation, I'd argue that Wolf is the weakest candidate to make a comeback if the 4 character cut rumor ends up being true.