"Offensive linemen are taught to get the arms down of defensive linemen on pass plays....its football 101."
I took this as holding as the only other way to do this is chopping the DL on a short drop. If the DL disengages and reads the play it is not the OLs fault. On short drops your cut the player, that's football 101 or OL 101. My guess is they didn't want to do that in preseason. You can "punch" a guy in the chest but not sure its going to bring his arms down, especially if hes backing off the line. It happens and its not really a concern to me. But Marrone not wanting to put that on his QB is questionable IMO. You're not wrong but the explanation was confusing.