The skill set he has is so obvious that Bean and Dabol must have brought him in to block and to contribute to the play of the younger guys in the room. They clearly want Dawson to develop into the athletic skills he supposedly has. I doubt the contract is very unfriendly to the Bills and my guess is lee plays out two years and unless he and the team are in a very good situation he is done.
I agree with you that unless he is injured he is a lock to make the roster this year.