It's going to be interesting to see which for which back the front office views LaDainian Tomlinson as a replacement. The smart money would be Thomas Jones. He would fit the role TJ would have taken, third back, veteran presence, and pass blocker.
Then again, maybe he'll be Leon Washington's replacement. In theory at least, LT is an elusive back and would be a change of pace from Shonn Greene's brusing style. The Jets could let Washington walk for a second round pick. This would presumably mean an increased role. For all the talk about a three back system, the Jets used two backs for the majority of last season. Shonn Greene got into the rotation only after Washington's injury.