Ok, so seeing as our hopes for Geno as FP5 are ever so slightly raised at the moment, I thought I'd share something interesting from many months ago.
So, y'all remember how Piranha Plant, Mii Sword Fighter and Duck Hunt were having weird glitches a few months ago? Well, we all know now that it was because they were being used as bases for the upcoming Joker, Hero, and Banjo.
So, thing is, I remember hearing from somewhere around the same time that Mewtwo and Mii Gunner were having the same glitches happening to them as well. This could possibly mean Mewtwo was a base for Terry and Mii Gunner was FP5 (maybe Geno).
Now, I know what you're probably thinking "But Wooooomy, Terry doesn't make sense to have Mewtwo as a base. Wouldn't Ken make a lot more sense" And you're definitely right in that regard but keep in mind, Piranha Plant was used as a base for Joker and someone like Marth or Robin or literally anyone more humanoid would've made more sense but they went with Piranha Plant. They still do have some similarities (like how Mewtwo's attacks all have a purple psychic effect while Terry's all have a fiery effect). Obviously, Geno and Mii Gunner have a lot of similarities (seeing as how he was a literal Mii Gunner costume in Smash 4) but it still could have been someone else (like Doomslayer)
Now, I understand you may doubt me and that's completely okay. Don't call me a liar though please, if what I heard wasn't true then it may have been a false memory or the reports of Mewtwo and Mii Gunner glitching that I saw were just completely bogus but I am not just making this up myself. Either way, I just thought I'd post this here for it to get inevitably torn apart in 5 minutes.