Petrus is more athletic than him. He showed a lot in the run game, and was improving as a pass protector. I think we have a future PBer in the making with Petrus, he just needs reps to work on his craft.
I like Diehl at RT and Petrus at LG bc I think that puts our best starting 5 on the field. Diehl may have lost a step, but he's still better than McKenzie. And I think the Petrus/Diehl combo is better than the Diehl/McKenzie combo.
But to be fair, most are higher on McKenzie on here than I am.