First off, do we know the real reason he's staying in Minnesota? Maybe he couldn't get a flight to Oakland tonight, or bad weather up there kept him there.
I understand he's probably all-but-gone, but I wouldn't say he won't be a factor in Oakland. They have a good back, a good TE, an average #2 in Curry, and a young, potential-filled QB in JaMarcus Russell. If they can improve their OL and get a good DT, they have a good player at every position.