The sticking point at this point is the compensation Jackson will receive from the Bills. Jackson currently is due to receive a base salary of $4 million in 2012, the last year of his current deal.
Per the source, it’s believed the deal will be finalized, soon.
It’s unknown whether the Bills would keep either Tylor Thigpen or Vince Young if they land Jackson. There’s a chance they’ll keep neither; Jackson’s eventual contract could shed significant light on whether one or both of the incumbent backups will stick around.
The compensation that the Bills will be sending to Seattle isn’t known, either. Early speculation has settled on a 2013 draft pick in the fifth-to-sixth-round range.