T.J. Duckett?

I wrote a while back that I have learned to never question Tim Ruskell, because he usually knows what he is doing. I just don't get the Duckett signing, though. Ruskell has said he believes Shaun Alexander can still be productive with fixes on the offensive line and with his health. Maurice Morris has also proven that he can be a contributor as a change of pace back and as a pass catcher. Leonard Weaver was one of the breakout players on last year's team and can be a contributor both in the running and passing game as the full back. So, where does Duckett fit in? At first glance I thought it was with intention of fixing the problems with short yardage situations. But if the problems last season were truly due to the line then that should be fixed with the upgrades on the line. Does this mean the Seahawks pass on taking a running back in the upcoming draft? A draft which is clearly deep at that position and with Ruskell knowing that Alexander is at least close to being finishes if he isn't finished already. It simply doesn't make sense. Maybe all Ruskell's talk about Alexander isn't true and he is just buying his time until he cuts him in June. Otherwise I'm not sure what Duckett gives you that Leonard Weaver doesn't already and he would be just taking a roster spot or carries from the running back of the future.