As many here said, if Geno isn’t 77, I still believe 100% (yes, 100%) that Geno will be a FULL FIGHTER somewhere, somehow in FP2 or Bonus.
That said, because for example the team can match the #7 spot with Crash4 release being Crash in Smash along 4 ported to Switch; or maybe a Pokemon due to how Pokemon is having things now; or even maybe another one.
For me there are two options:
a) match the #7 DLC/#77 Fighter with Geno from The Legend of the 7 stars right now in October
b) match Geno with another number like #78 or #79 to coincide him with the 25° anniversary of SMRPG in March 9 (first release in Japan)
My conclusion: For me it would be more epic to have Geno as THE SEVENTH DLC, THE SEVEN STAR, literally, right now, with SMRPG coming to NSO. Also you can celebrate the 25° in March 2021 with a Sequel or Remake.
Anyway, as #77, #78, #79, #80, #81, a Bonus Character or an Echo of Blue Toon Link (just kidding on this), our puppet is happening 100% as a playable fighter that JOINS THE BRAWL!
But for obvious reasons, I hope Geno is happening right now for us to not wait any more. Anyway I think this wait will be worth cause GENO DESCENDS FROM THE STARS!