In my opinion, Hawk has more value than Lynch. Yes, he's been reduced to a base LB in our defense, but that position is also one of the deepest on the team. I have no doubt that many teams would see him as a full time 3 down player.
Also, perhaps another coach thinks he can get more out of him than Moss does? With Hawks potential and lack of any off the field concerns, his value exceeds that of Lynch and would be worth Lynch and another late rounder, IMO.