The final "QB decision" in Seattle is not likely to come down to competition anyways but rather who can stay healthy behind a starting five that have never played together before. Let's consider the five starters on the 0-line; lots of individual talent that is very young, nobody on the o-line has ever played a single 16 game season for the hawks at the position that they are penciled in at, and there is no real everyday fullback to help out.
So the question becomes, which QB can play here & not get killed? Hasselbeck got killed every year since 2007 & could not play 16 games in any of those years since. Yet Hass's agent wanted a 32 game/year contract for a player that has little mobility, and is unlikely to be available at the end of any 16 game season. Whitehurst is likely the best vertical hurling QB on the team, and I base that description off of his college highlite real. What the team asked Whitehurst to do last year, simply did not match his skills/history, so he collects even more rust. Then along comes Jackson...If he can avoid the heavy hits in the early part of the season behind a rookie o-line, then he's got better footwork than what I've seen from him.
Keep Whitehurst healthy. Good chance he will be the starter by years end. Again.