They explained like during camp arc that AFO found the healing ability way too late so he couldn't heal himself properly (i know) and All Might prime is still stronger than Star he was the number one in the worldanyone find it weird how All For One was permanently disfigured and lost to a guy whose power was "punch things super hard" and shiggy is tanking reality warpers
the powercreep in this series is insane
Both AFO and All might were nerfed by injuries so we never seen there true powers