Doesn't matter whether they're tired of dealing with him or not, there are agents with reps that GM's don't like to have to deal with them, Condon and Rosenhaus come to mind.
France is going to get that with the GM's when he gets Prescott this deal and he could care less. Just watch the line to sign with him once he pulls this off. As long as he's listed as an agent in good standing with the NFL, he could care less what owners, GM's or fan bases care about him.
I do not get the backlash against Prescott in this at all and no, France isn't inside his head. They've discussed where their line is and what Prescott's part in this is and he's played it really well. He's doing exactly what anyone that believes in their agent, or their lawyer, does, take their advice. That doesn't mean they're being puppets either, Prescott has told France what he wants and France will get that for him.
Have you noticed that a different agent seems to get that "hard to deal with" tag every year and that just dissipates? We don't discuss Condon or Rosenhaus much anymore but they're still the same guys.