David Lake said on a recent podcast said that he believes the issue is somewhat mental... Apparently he doesn't have much cartilage left in his knee and it is pretty much bone on bone. The discomfort is leading to him taking it slow out of fear that he is going to reinjure himself (understandable given his history). But the team's take is that is likely how it is going to be and he is going to have to get used to that feeling if he wants to play. They are willing to play him if he gets over that hurdle, but they aren't waiting on him either.