I have a hard time believing that Marv and Co. don't want to sign Nate, London and Kelsay, as well as keeping TK and extending Willis. But the fact of the matter is that you really can't live one year at a time...Nate, Kelsay and Willis will want long-term deals (at least five years) and so will London (figure at least three years). TK is under contract (more then one year remaining) of course, but his value ($$$ vs. impact) needs to be evaluated.
My feeling is that Nate will be allowed to walk, and London and Kelsay will be made respectable offers. Whether they want to stay or try for a few extra bucks elsewhere is left to be seen. Willis will have to suck it up and get into camp under his current deal. The Bills will then work with his dickhead agent to get something done by midseason that will extend him for at least five more years. Face it...when he's on his game, he can be a top 10 back. Lastly...TK stays and has a much better year next year.