Losman is an unknown, with him you could go 4-12, 12-4 or anything in between. You know what Holcomb brings to the table, he might win 8 games, but would likely fumble 2 of those away in the 4th quarter.
He was originally brought in as a backup to Losman and accepted that role. To be in competition for the starter role gives him maybe his last kick at the can in that regard. He's playing hard and doing his best, but he's being surpassed. He's a constant, where Losman's upside is just begining to be tapped.
Will JPL be anything more than what he was last year? ....He already is.
Will he make it in the NFL on any level as a QB? ......Even Wyche who worked closely with him in the last regime and may know him better than anyone, says he thinks he has all the tools, but would'nt guarantee that he would 100%.
I'm sure Levy and Jauron made enough enquiries and saw enough film to think he was worth a shot. Nall was brought in not only for extra heat in that race, but for a good look to see what potential lay there as well.
If it does'nt work out, look for the Bills to do what you did here in the free agent market next year.