The choices may seem logical, but that is exactly what the problem is. These are the kinds of wild, yet logical guesses people have been making for a while, and they were blown out of the water with Joker's reveal. The fact that people are believing in 'safe bets' is what got them flipped on their heads at the VGAs. Along with that, apart from the weird case of Erdrick, an NoA insider literally said that no one knows the DLC. Info is coming out as they are being developed. The leak comes with a lot of attached fiction and reasoning behind it, as well, which is 9 times out of 10 the sign of a fake leak.
I'll let you in on a little secret when it comes to Gamexplain, too: a 40 minute video making guesses on the leak and making it seem so enticing is because that's what they do to make their bread. That prints money. All those mid-roll advertisements from people clinging to a leak is what gets them that dosh. The only reason they never covered certain leaks like the Grinch one is because they knew for a fact that it was fake. They've covered many fake leaks like this in the past, and this won't stop them now.
Do they have insider info? To an extent, yes. Are they infallible? No. Are their certainties something I believe in? No, as they've done this many a time in the past. After all, if they show all of their cards so handily, do you really think Nintendo would keep their open affiliation with them? They have to play their cards carefully. This leak contradicts information we know from insiders about DLC knowledge and even words from Sakurai himself about how far into development the DLC is. It could be something that's nuanced and is real, but it could easily be fake, as well.
Leaks like these are taken with a grain of salt for a reason. Don't discount them entirely, but don't cling to them. Given the track record of leaks like these in particular, too, my bet is this one is fake, even if I'm not 100% on it being so. Temper your expectations and don't argue like unproven leaks without any evidence are absolute fact. It's a very flawed approach.