‘J.P. Losman, who has started more than 30 games for the Bills, isn’t happy being a backup for 2008 after losing his starting job to Trent Edwards. But to his credit, he’s making the best of it, knowing that any playing time he receives is an audition for 2009 when he becomes an unrestricted free agent. Against Arizona last week, he was 15 of 21 for 220 yards, one TD, one interception and a 101.3 rating. He hooked up with WR Lee Evans for a career-long 87-yard TD, throwing the ball 60 yards in the air, and later scored on a QB draw. The big benefit for Losman and the Bills is that he won’t be as rusty should he get the call again to replace Edwards, who has durability issues. “I felt the whole game I rushed it a bit,” said Losman, who last played in a regular-season game last Nov. 25 in Jacksonville. “I hadn’t been under fire like that in a while but I’m glad it happened early in the season. Now I’ll be more prepared as the season goes on for that same situation.” Losman was sacked five times by the Cardinals and wound up with three turnovers. Pocket presence has never been his strength, the key reason Buffalo’s coaching staff turned to the quick-thinking, quick-reading Edwards.’