This rumor has been fun to watch.
It started off as a blog post on some guy's personal page. He knew a guy who knew a guy who talked to AJ Hawk who said he was being traded to Buffalo for Lynch. WGR reported it on their morning show clearly identifying where it came from. Over the next 48 hours, it made the rounds and hit the national media cycles.
All from one guy's blog that's probably full of shit.

It wouldn't been a bad trade. Marshawn is pretty useless here, and they have needs at LB. Not sure it will happen until after this week's game, if it happens at all. Lynch is not going to get significant playing time, even if he does stay; Spiller and Jackson are your guys. Lynch is your situational back. Assuming he'd get 1000/10 this year is laughable.