According to the Packers-heavy local sports radio show, the conjecture is that they plan on bringing in a guy for depth, not to usurp Jackson. Which I think is a pretty good idea. Jackson isn't even much of a drop-off from Grant anyway, and Green Bay's offense isn't exactly biased towards the run game. It makes no sense for them to give something up of value to put in a system that most RBs can tread water in.
Thanks to eagles21 for the awesome sig
Representin' the Cafe in the IBL league: 73-34, 15-8 in Championship Tier playoffs
Money league: 9-4, #1 seed one and done