Pocket Presence is a nebulous thing. I mean..There is no stat for it. Dan had amazing presence and vision in the pocket. I watched some old games recently, and, it struck me how, in turn, one could read HIM. He was looking at one side of the field...looking..looking..looking..Then, he turned to the opposite side and, *BOOM* The ball shot out like a rocket without him even looking at the reciever it seemed.
I think if tested, Dan probably has unreal periferal vision. In my limited football career, I was downright slow. I could not get to somewhere unless I had a jump on the other players, and, I was able to do that many times with my abiity to sense and process movement without actually concentrateing on in. I'd bet Dan has that.
He also could sense pressure. Then, he had his little shuffle step that I saw make rusher after rusher miss.