I think a good left guard may help AC. Even when he gets his guy high and wide, the QB can step up in the pocket with the DL in his face. Stop that bleed and AC will look much better. Just my opinion. He's not perfect by any stretch, but he makes LT a much lower priority.
Kris Richard is actually somewhat intriguing to me, though I don't know a ton about him. Has obviously done a nice job in Seattle on the defensive side of the ball moving up through the ranks. Hope it isn't just to satisfy the RR.