The reality is teams have figured out Lamar. Purdue and UNC had the right game plan, take away his ability to run/limit big plays, but they just didn't have the players to execute the game plan. Clemson has the players and coaching to make Lamar beat them with his arm and head. At this point he isn't capable of reading defenses or throwing people open which is a must against really good defenses..
Can Lamar be a really good passing quarterback? I have my doubts, he made very few good reads or throws last night. I think this team is going to have to rely on the running game the rest of the season.