The Bills signed Kelly Holcomb to a 4yr/6.6 million dollars contract. He will back up J. P. Losman. I think Holcomb had been Cleveland best quarterback the last few years but for some reason the managements/coaches dont like to start him. At least the Bills will have a pretty good experience quarterback in case Losman is dud.
We're not going to know how Losman will pan out till the season starts, obviously. BUT, I can't see him coming off as a complete dud. I expect it will take a couple of years before he hits his peak - less he turns out to another Rothlcantspellhisfuckingnameburger... Which, is unlikely, but you never know. Anyway - getting a decent vet as a back up is a pretty good move on the Bills part.
The reason Roethlisberger did so well is because he had a supporting cast around him. His offensive line was awesome, had two go-to receivers (Hines Ward and Plaxico Burress) and had the Bus and Duce Staley in the backfield.