My question when it comes to the guards is was he 50 slots higher because it was a weak guard class or because he was perceived to be 50 slots better. In other words, when there are four of five tight ends considered better than you because it's a strong class, it pushes down your value. When you are the best or second-best in a weak guard class, it pushes up your value. Players aren't graded in a vacuum. Value is relative to what's available. Fewer good guards being available in this draft drives up the value of those who are. More good tight ends being available drives down the value of those who are.
Without Kincard, Musgrave and LaPorta, Mayer probably ends up being a first-round pick. Without Kincaid, Mayer and Musgrave, LaPorta probably ends up being rated quite a bit higher and probably a first-round pick.