Sunk cost, it was an error to have acquired him, he wasn't a good fit with our team, the FO recognized it, it was a very costly mistake, he's gone, the team got something if not much for him, good riddance.
Getting anything for him in the time it took to show him the door was a positive. For the team not to be cap strapped b/c of getting rid of him even better. Frankly I thought it was worthwhile risk to try to get him to work here as Harvin is an uber physical talent. There were times he clearly looked like he was playing on a different level than everyone else on the field and was amazing and exciting to watch. However, he's a genuine headcase, and if Percy doesn't want to play he doesn't. He has the talent to be a genuine star in the NFL but not the head or heart. That certainly doesn't fit a team where everyone works together for the benefit of the whole team.
I'm good with a 6th and think the FO learned an expensive lesson going forward from this situation. A 4th from the Jets is still possible and of course better than a 6th, but I won't hold my breath. Fretting about what could have been fails to acknowledge reality that Harvin was unwilling to fit in here. The team got some extraordinarily expensive big plays from PH but all in all in retrospect perhaps should have just passed on him.
He's no longer a Hawk and frankly he can rot as far as I'm concerned. Hope the Jets can renegotiate his deal and the team gets the 4th as the trade compensation, but all in all I don't want to think about Percy anymore.