One more quick thing.
Of all of those players who held out after being tagged, none demanded a trade. Why not? Its not like their agents didn't think of trying to pull that move as a negotiating tactic. Well, one reason would be that it reduces their value, or more accurately increases the risk for any team trading for him.
So if AD demands a trade, the trade partner not only has to agree to a YUGE contract and give up premium picks, they have to worry that they are signing a player with a history of holding out and demanding a trade. Whose to say in two years if AD is still not the highest paid non-QB, that he decides to hold out/demand a trade again? If as some speculate, AD isn't interested just in the bottom line dollar figure, but the "respect" in being paid the most, how do you know you can keep him happy for the duration of his contract?
Introducing that kind of risk actually decreases his value. All parties know that if AD holds out that trading him would be an option for the Rams. Demanding a trade would be counter productive in some ways.