I think all of these guys are good prospects and should be there in round two. IMO there is no center worth a top 15 pick in this draft. The espn crew projects Mack as a 2nd or 3rd round pick, for what thats worth.
Does anybody know what happened to LeCharles Bentley? He was a really good center then hurt w/Browns, released at the beginning of the year and is still on the street, did he reitire or he could be an upgrade if healthy.