Because there are obvious reasons why I think Leftwich and ben are going to be better than JOsh, and so does EVERY team in the NFL(or they wouldn't have passed on Josh 2 and 3 times in the same draft).
Pennington sat behind a veteran, and when he played, he played well IMMEDIATELY. 22 td's 6 picks 104 QB rating in his first full year of playing, year 3 in the NFL. Pennington had a 100+ passer rating in the first four starts of his NFL career 5of the first 6 and a 99 rating in his 7th, this was a guy that was brought along slowly and when he was ready, he was ready. Josh was brought along just as slowly, got some PT last year, and still isn't close to ready to hit the ground running.
Leftwich started slowly, it's his 2nd year and he's already accomplished more than Josh, as badly as he's played with the game on the line he's been able to give his WR's a chance to make plays to win games. he has a rocket arm himself, he's accurate, he sees the field, he's going to be extremely good.
Ben will struggle the next 3 games, Dallas, NE and Philly, 3 of the better defenses around. Nobody is saying he's a Pro Bowl QB yet but again, he hit the ground running. for every mistake he makes, and there have been many, he's making big plays.
Let's put it this way, after this year Josh is either going to get a new contract here, or elsewhere, does anybody on this board really think he'll get anywhere near as much money as Ben or Leftwich? Why not?