You know, I find the whole Porky Spirit speculation thing kinda ridiculous - most of the Mother villains are absent as Spirits, no Giygas, no Fasaad, none of the Sanctuary Guardians, no Franky - like, Ultimate Chimera, REM, Master Belch, Masked Man and Starman have Spirits, but 3 of those have major roles in SSBU, one is a joke boss and arguably a mascot, and the other - well, spoilers. I feel the reason for Porky and Giygas' absence from Spirits is because they wanted to focus on the whole "power of friendship" side to the Mother franchise over the its darker side, perhaps so someone going in to the series having only played Smash would still be surprised by the dark themes