None of us a collegiate coaches, if we were, we would not be professional Keyboard coaches like we are. My guess is that, in this scheme, playing off the WR does a few things:
1. Keeps eyes on a QB who is obviously mobile, yes you can run tight man to man but then have to have a spy and that takes a player away from either putting pressure on the QB or losing an extra cover man, if you don't get to Gunnar, he will pick you apart and if we had run straight man to man tight coverage, he can run (pick your poison)
2. It protects against the deep ball, we were in this game till the ladder part of the game, playing tight opens up the downfield throws, it becomes a high-risk risk high-reward defense for us, if you lose, you lose big (see Texas defenses under Manny Diaz and Carl Reese), if Texas would have given up big plays earlier, we are looking at one of those insane 63-13 (2003 OU) and 55-17 games (2011 OU)
3. It keeps eyes on the backfield, although we got gashed on Defense, we accomplished one goal and that was we limited UGA on the ground, we did force some stops in the first half that were critical