User blog comment:Staw-Hat Luffy/Dat Blind Guy/@comment-5640399-20130306193028

He's the former Worlds Greatest Swordsman. He drew his sword before the massive hole appeared, so I'm going to assume it's connected to his blade. Either, he's an awesome swordsman with crazy skills, or his sword has eaten a DF, and he used it's power to make the hole. If the latter is true, he's either a marine or he took the sword from one, since VP is the only person we know for sure can but DF's into inanimate objects.

Just a thought, maybe he wasn't the WGS, but he trained Mihawk, and then Mihawk blinded one of Zoro's eyes to make him more like his old master... No particular reason I can think of to do this, but it's just a theory

I presented some of these ideas furthur down, just thought I'd put my 2 pence in for myself.