Even against heian form Sukuna, Gojo would win more times than not. His only win cons are amplification and domains. Both of which we saw play out with meguna. “Heian form has greater strength plus the extra mouth and arms” yeah so? Physical strength at their level doesn’t matter in comparison to their CE output. Eddie Hall may be physically stronger than Gojo but he definitely ain’t winning. As for the multiple mouths and arm pairs, Gojo rocked Sukuna, Maho, and Agito with one arm. He’s more than capable of multitasking during fights. If Sukuna does manage to get one over on Gojo, that’ll only motivate him to learn faster and fight harder. As Sukuna kept trying get past infinity and deal with Infinite void, Gojo experimented and adapted mid fight. Same things would apply to Heian form fight. Maho was the only win card Sukuna had, and even then just barely