First, I think this is nothing more than a PR stunt by Marshawn to keep his ego inflated and his name in the headlines. Things like this help him sell lots of SWAG.
Second, if he wants to play, pay up. You owe the Hawks the signing bonus that they haven't asked for back yet. If you want to play, someones gotta pay, it's a business thing.
Lastly, the Hawks took a 5 million cap hit the first year he didn't play, someone needs to reimburse the Hawks for this in some way, draft pick(s), transfer some of their available cap room to us if they can do such a thing, etc.
I wish him the best and will always have a memory of both Beastquakes but the Hawks will not let him play without covering the above listed things, it would set a precedent that the entire NFL would not like, AT ALL, and they just will not do that.
GO HAWKS!!!