The only reason I'm inclined moreso to think KOS MOS has a better chance than normal is because of a reason that's not a very good reason in the first place.
The Mii costumes.
We're still missing a handful, and a good amount of those are the Namco ones, which I just don't see them scrapping.
Joker brought most of the SEGA ones, Hero got some new Square ones, Banjo didn't get any Microsoft ones but we got some returning Capcom, a new Konami and some Nintedo ones, and Terry brought some SNK with the Akira and Jacky ones returning.
Mii costumes returning, at the end of the day mean absolutely nothing since they can pretty much come with anything as Banjo is shown, so for all we know, Fighter 5 may not have any Mii costumes and they just dump a bunch of old ones with them.
But the Heihachi Mii not retuning with Terry when they brought attention that these were a selection of Fighting Game costumes is a bit sus, as minor as it is.