What AD is doing is not new. Orlando Pace used this tactic to get out of TC practice and avoid injury on the advice of his agent (one of the Posten Bros.) Pace held out of TC his rookie year, '03 and '04 that I know of for sure. On the face of it was money, but Pace admits now that he's retired that his agent didn't want him to risk injury in TC.
Can someone post who AD's agent is? I'd like to research AD's agent and see if there are players who has held out, there may be a pattern.