That doesn't change that fact that we still found the codenames for both Joker and the mystery character not three or four months ago. Remember, Bayonetta and Corrin had their stats entered before the Smash Ballot was even announced, meaning that it's still very likely the next character is "Brave", which is most likely Erdrick/some Dragon Quest character.
It doesn't matter. We have absolutely zero knowledge of who Brave is. He's not "most likely" this character. That's a very flawed theory that we lack any good evidence to go with. First, the codename doesn't have any similarities to Joker or Arsene's, which already establishes there's zero patterns here. Second, the stats give us zero clues.
The only thing it's most likely is that it's a character who legitimately connects to the codename of Brave in a meaningful manner. That's all we could seriously tell at best. Though I'm still waiting for an answer if there were codenames for the rest of the Persona 5 cast that made cameos among the stages and all. Also, Jane got scrapped as well, and that appears to be Kasumi, which doesn't seem to have any real connection.
We got nothing to go off of of note. What we do have is a few leakers who have heard Erdrick, but that really correlate whatsoever with Brave, which is an extremely mysterious codename that could just as easily be a weak one that could relate to just the fact the character is an hero at best. Which frankly I doubt, but with zero codename patterns we can tell(at best Arsena and Joker's codenames may be direct references to specific characters that they relate to. Jack Frost for Joker and Sherlock Holmes' Doyle, but that's kind of it. There's little in common beyond this factor, and that might not be why he was codenamed Jack either). That's how in the dark we are.
You know why most people on this forum believed Brave was Erdrick? It's cause leakers said so, but they had zero evidence for that, but just a basic theory that Brave is Yuusha, which isn't evidence as is. That's why they were so sure, and acted like they knew something. Less than 10 people have actual rumors that it's Erdrick by being told so. Most of the leakers and evidence by using Brave don't have any more clue that we actually do. There's a pretty reasonable chance it's not Edrick as well. He used to be likely, but learning more of the codenames shows it's far less simple. Besides, Brave is the only name whatsoever that cannot be tied to an actual character name, which is a very big deal in keeping it mysterious. Jack, Jane, Doyle, and Packun Flower are all character names of sorts. Brave literally is not. It's an all new codename style that doesn't tell us much. The stats don't either, since we cannot apply them meaningfully enough. Basically, the stats give us a window of sizes/speeds/etc. the character could be. But it doesn't give us a hard setting of how they will fully play, but purely a theory of how it could possibly work. That makes the so-called evidence extremely flawed. Besides that, stats have changed many times before the final version, meaning they likewise aren't that useful as data.
Basically, our evidence is very flawed and not that useful. The stats could just as easily work for Slime as well as Banjo Kazooie, who all could just as easily be tied to the name Brave if they wanted to(since we don't really have a consistent enough codename pattern to usefully predict their plans). There is no precedence for this kind of codename. The other previous codenames were actually way more clear in many ways. Or at least more tangible than this.