Julius Jones is the main piece in the remodeling of the Seahawks running game. The Seahawks theory is that while Alexander wait for holes to develop in an iffy offensive line, Jones will burst through and make his own. Besides the difference in running style, Jones also caught pass after pass thrown to him. Alexander was a liability in the passing game.
The Canadian Press: Julius Jones begins replacing Alexander as Seahawks lead runner
I like Julius Jones, always did. But if they think he is going to make those holes on his own behind a poor line, I am afraid they have another think coming.