User blog comment:Kaido King of the Beasts/Fantasy One Piece Matchups/@comment-35435049-20170707202937

Well, of course Ichigo could probably take down Zoro, while in Shinigami mode, but Zoro would still sense him (Haki). If you can see Zoro, he can see you. If you can't see Zoro, you may be only seconds away from death (either that, or he's lost).