Greene had over 100 more carries than LT so comparing the stats isn't really fair to LT. The Chargers have obviously stated their intentions for this season, they will be a mostly passing team and they used sproles in the open field more last year anyway, so that money could be used elsewhere. However, not being a hater, but last game Chargers played they were under immense pressure and the discipline crumbled as you saw. The main thing I'd be worrying about if I was a Chargers, is what will they do in that same position this comming season? Because they will be in the post season without LT in my opinion.
For the Jets I think its a solid move adding LT to backup Greene seeing as Jones is gone. Jets will also be in the post season