We've done this to death. Geno wins no matter what:
Joker shilled P5 or SMTV but was also a dumb popular character
Hero shilled DQXI but was also from a IP that was dumb popular
Banjo shilled nothing but was a dumb popular character in the Smash community. He is the combo breaker of FP1
Terry shilled the new KOF and the bevy of SNK games on Switch but was also a dumb popular character (outside zoomies
)
Byleth shilled FE3H but was also dumb popular (outside actual Smash fans
) or at least is the exception to that rule
Min Min shills ARMS but was also a dumb popular new Nintendo character
Whether Geno shills for a new SMRPG or he's just a dumb popular character with Smash fans, he doesn't break any precedent. If anything a remake/sequel is going to make his chances moon