User blog comment:Kaido King of the Beasts/Chapter 821: Last March of the Elephant/@comment-24850639-20160331121323/@comment-5398287-20160331131653

Consider this: Issho, Sengoku, and the VAs were just fighting to get Jack away from Doflamingo, and they succeeded in doing a fair amount of damage. Meanwhile, Zunisha was fighting not only for his own life, but for the lives of everyone on top of him - and that single attack must've packed a TREMENDOUS amount of brute force, more than all three Admirals (past or present) working together could create, I'm willing to bet, because of Zunisha's sheer size and the speed at which it was moving.