I always hated the argument that one guy was winning more than the other. It always came across as such a cherry picking stat. Games like the Cards game last year where Trent got hurt on the first drive would be counted against Losman, but for some reason, if the same thing happened and the team won the game, they'd count it towards Edwards' record. I know that happened two seasons ago when JP replaced Edwards and put up big numbers, beating (I believe) the Bengals. Then there was the Losman injury at the start of the season against New England 2 years ago. He got in one or two drives and yet was still blamed for the loss. It seemed like anytime a QB change happened in game, the negative was always thrown towards Losman while Edwards always got the free pass.
edit: And I'm in no way trying to defend Losman. He failed and there's no arguing that. I just never understood why Edwards was always given so much praise.