I got curious about how Marshawn Lynch has done since joining the Seahawks, so I looked it up. Here's the damage:
Car 50 Yds 140 Avg 2.8 TDs 1
That doesn't mean Lynch would have such low numbers for the Packers, of course. Maybe the Seahawks have bad run blocking. But then again maybe they don't. Here are the numbers for their other RB, Justin Forsett, who is not exactly a household name:
Car 75 Yds 334 Avg. 4.4 TDs 1
Maybe we're not missing out on much. The one time I saw Lynch play this season was against the Packers, and he looked pretty mediocre in that game, so this is no big surprise. He had already fallen to their third string RB by that point, but they gave him a lot of carries so they could use him as trade bait.