The thinking here goes like this....
Some in the league think he "dogged" at least half of the season. Some in the league think he was a victim of Vilma emerging as the teams captain, the team's injuries, Herm, etc etc
If he has another subpar year, we'll be stuck with him till the end of his contract. If we can eat part of the contract and send him off, we'll have a better chance of re-signing Abe's.
Or, we can try converting to a NT. But, thats a bit of a stretch and we would still be stuck with his contract if he doesnt do more than avg. at the position.