User blog comment:Ghmorello/Chapter 919: Gotta Get Back! Back To The Past!/@comment-24850639-20180928170343/@comment-35421084-20181001113709

Fliu

Ah the old Zoro hasn't used Asura argument, just becuase Luffy and Sanji use Gears and Diable Jamble all the time in New World and Zoro hasn't used Asura since Saboody.

Maybe Robin sued him for copyright and he doesn't use it anymore.