I don't know about that, but deep inside I think he did get one of Mihawk's eyes. Maybe it is because I would like to see something like that so much U_UU_U
As we said before, you can't open a damaged eye. Its not like hes Kakashi who got a brand new eye placed in there after he got slashed. He got it during the time-skip(most likely because of Mihawk's training). No, Oda is too creative to do something so Naruto-ish with making your "eye open up and have powers". Its not like Mihawk gave him a Hawk-eye or something >.>
LMAOIt has something to do on why your won't reply to our fight.