That wasn't your original answer.
Be that as it may, this trade bothers me. I have to believe there is a difference for the player in getting traded, as opposed to negotiating one's own future, as in FA. Does Cassel want to be in Buffalo? (Or, maybe not: maybe Cassel's glad someone grabbed him. Who knows?) And, if this trade makes it less likely that they get their first choice of FAs (which it might), then that sucks, too.