I don't think it has anything to do with Jackson, as I've been saying all along, it has to do with the team's situations. To save myself some time, I'll just quote one of my posts from the other day:
I don't see many teams ahead of Dallas taking a shot at a 1st round RB. I think the best chance is Detroit trading down a bit and getting Jackson, but #6 is too high for him. As for the others:
Pitt: Like has been said, they need a QB or a CB much worse. I've heard they love Rivers and he could very well drop to them. A CB would also be able to step in now and I don't think they'd use a 1st rounder on a RB to come in in 2-3 years when their biggest FA signing was a RB.
Bucs: Similar situation, they brought in 2 FA RB's, and have tons of holes. With that many holes, why would they spend nearly all their FA money AND their #1 draft pick on RB's? Usually, when teams draft RB's to come in down the line, it's in the 3rd round. 1st round RB's are expected to step in immediately, and that isn't consistent with the signing of Garner.
Denver: I don't know why everyone thinks they definitely traded up to leapfrog NE/Dallas for a RB. They've been much worse off at RB before, and waited until later rounds to draft them. I don't see why no one has picked up on the fact that they haven't been able to resign Ian Gold at OLB, and they've jumped ahead of teams like Minnesota that might take a LB like DJ Williams out from under them...My guess would be that Denver goes LB with their 1st rounder.