The obvious question here is, if he was good, why would Seattle just give him away (or cut him, which they reportedly would have done if they hadn't traded him)?
There could be a lot more than just the "Dallas" tweet which included fond words of Family watching games..
I might be mistaken, but I would think his agent could have spoke up too.. I understand that its not like Seattle had H. Walker riding the pine.. But the guy appears to be going nowhere fast. Its possible that an agent could only hope to see one real multimillion yr. deal...
Seattle has to have a conscience that the young man wants to play Ball. Theres a lot of news storys (used to be anyway) that CMike is a baller who needs an opportunity.. The Seahawks know how to evaluate and draft too. They most likely already see a small handful of RBs who will be soon turning 21, and fully capabale of getting the job done. Cheaper, and recovers from injury sooner.
All that being said, if it was me? Id let him go, if I thought he had a shot to really do something! I would want potential players for my Team to know 'This is where you Hope to play', but we will get ya ready to Play!
p.s. The dallas tweet, could have been a slap in the face or biting the hand that feeds