The Seahawks have released FB Michael Robinson. Robinson, a Pro Bowler in 2012, was due to make $2.5M in 2013, but none of that $2.5M was guaranteed. This move was made in order to free up some cap space for the team (a net of ~$2M with Spencer Ware or Derrick Coleman probably taking his spot), so they can roll more into 2014.
Robinson had been dealing with a serious illness the past couple of weeks which kept him away from the VMAC for a while and had meant he'd likely miss at least one week of the regular season. We've talked about Robinson becoming a possible cap casualty since spring, but this illness surely didn't help his chances at the roster. Still, there's always the chance that the Seahawks could now re-sign him to the team in a few weeks once he's fully recovered, assuming he'd be willing to come back at a more cap friendly rate.
The Seahawks have been using tight ends, along with Spencer Ware and Derrick Coleman, at the fullback spot the past couple of weeks and apparently their flexibility there helped the front office make this tough decision.
Robinson was in the final year of his deal, is 30 years old, and only played in about 31% of offensive snaps last year so the $2.5M price-tag was pretty steep, even for a locker room leader and special teams ace. I'm not ruling out a return at this point though - a similar thing happened in Baltimore with a cut and re-sign of Vontae Leach. Leach didn't see much interest on the open market so Robinson could possibly expect the same.