So if Ringo had learned to master his ability and turn back time with just his mind and not the watch, he would have been the strongest stand user in SBR right?
Also JoJo thread
no. Dio Diego (2nd one) would still kick his ass.
Are you sure? Unless the blow is fatal he can turn back time 6 seconds while Diego can only freeze it for 5
Deigo with The World could probably do an instant kill if he gets within range.
Otherwise the only other stands that could theoretically produce an instant kill that would not allow him to automatically rewind time would be Chocolate Disco. By dropping something like a nail on his head without Ringo knowing what the ability is first he could kill him. Though given the characters nature I doubt it would turn out so easily.