An agent's job is to get his client as much money as possible. Not to give a hometown discount to your favourite team. So, in terms of Jason Peters, he's a great agent. And if he can negotiate a long term deal for Byrd to make him the highest paid safety in the league, then he'll have done his job again.
Seriously people, we have cap room, and the money is not coming out of your pocket. You need to stop looking at whether he's worth what he's asking and look at it who he's gonna be replaced with.