Originally posted by KentoCell said that he could have probably whipped up a Spirit Bomb:
Why couldn't Cell use the kaioken? He obviously knew techniques he had never seen before because of the people he was composed of.I mean, besides the obvious, if he could use Kaioken, then ssj2 or even ssj3 would have been useless against Perfect Cell
https://ibb.co/stxL9QF
So if he knew about(and could potentially create) a Spirit Bomb, then using KaioKen should've technically been possible as well... Though it obviously could not have happened in the story itself for the reasons you mentioned. I mean, SPC w. KKx4 would have been SS3 level, ffs. 😂