People already mentioned the talk of Bonus fighters being detrimental to the leak due to the Statements from Sakurai saying otherwise, with that out of the way, other thoughts
-For the Statement seeming to Implicate Pyra/Mythra, one of the things that's interesting is that this person said that people would be angry at "Their" Inclusion, which if you look at it a certain way, could say they knew the Character would be multiple
Though to be honest, saying this character is more low-key and perhaps gonna get some people angry is not the hardest thing in the world, as this character would have been more low-key if they are before E3, and just in General Nintendo Direct
-For the Statement seeming to Implicate Kazuya, I do agree that this statement fits way more for Sonic than it does Tekken. Heihachi did get discussion during Base game, but he was way more popular as a suggestion for DLC, and I think if this person said this series would be DLC or something like that, this statement would be more impressive
-Getting the Dante Mii Costume right is pretty good, though to be honest, it's not as impressive here considering that this person is thinking Another Capcom character is coming as playable. If you think a Capcom Character that's not Dante is gonna get in Instead, of course you suspect Dante would be a Mii. I've even seen people that didn't even think we get a Capcom character throw around the idea of a Dante Mii Costume
-One of the things not Implicated here is the Presence of Bethesda (Again), and Wayforward, since they got costumes in Kazuya Mii Pack.
-The Waluigi statement is interesting, only because this isn't the first time someone said Waluigi would be Last. Paragon also did say this is what he heard when he heard discussions of Waluigi. the reason he said Waluigi was Last in FP1, because Paragon didn't know of FP2, so assumed FP1 be it
I think this leak is interesting, but considering Sakurai has made the strong statement about Development on Ultimate ending after this Fighter Pass, I can't buy that it the realistic leak out there
I don't doubt that there could be talks already ongoing for the future of Smash, since I think if Nintendo wants to continue on the path of crossing over with many 3rd parties and franchises, they need to start discussions Now (sooner rather than later). still at his word, Development is supposed to end. One thing I could maybe see is perhaps they take a gap break so Development isn't continuous, or they outsource the rest of Development to a different team not associated with Sakurai, though I heavily doubt that
On Phoenix Wright though, I will say that there could be hints suggesting he'd be in. Perhaps the biggest thing is the Cloud Cross Slash glitch that appeared in this patch, since that's the only move that uses some sort of Kanji Symbol, which to be honest I only see Phoenix Wright using for his Speech bubbles and stuff