So here's what I'm thinking.
I think it's possible that Crash, Ryu Hayabusa, and/or Reimu are in play for Smash DLC. However, I think it should be noted that Hayabusa has been in Smash Ultimate leaks since literally the earliest leaks of Doom Slayer in Smash. Every single leak he has shown up in has been shafted and thrown into the trash that is the fake leak bin.
I'm also getting the feeling that Fighter #5 is going to be somebody that hasn't been "leaked"...that is until they literally are. I just feel as though Hayabusa has been the focus of many leaks, and while that doesn't mean he isn't likely or doesn't make a ton of sense as a character, it seems as though he's been a part of the conversation because he's been in a ton of leaks.
There's something to remember with leaks. For all the leaks that are right, there are those that can guess something and get it right, even if the information wasn't actually leaked. Ryu Hayabusa fits that more or less because he's a classic character that had spotlight from retro era games, and KT works closely with Nintendo.
PS- there's some stuff going around with Sabi that Brew can't talk about Hayabusa because he's been served a C&D, but that literally breaks the C&D because in saying he, "can't talk about Hayabusa" that's talking about Hayabusa.
Basically, another fake C&D.