Board Thread:Questions and Answers/@comment-26955371-20150920164120/@comment-26955371-20150920175307

You're right However, Gin stated that his Zanpakuto was the fastest then he said that it ( his Zanpakuto not his Bankai iirc ) was Mach 500, Ichigo couldn't even see it ( and he was paying attention ), Aizen knew Gin was going to betray him and he couldn't react to it ( he was fighting vs Yoruichi/Isshin/Urahara in his previous ( so weaker ) state ) I think it could be that fast