LT sitting is possible, but unlikely. It's not that he's too hurt to play, they just want to give him a full 2 weeks to rest. I'd expect him to play just as he's done in the past few weeks, coming out somewhere in the late 3rd/early 4th quarter, depending on the status of the game.
Unless you hear something certain, don't even think about doing this pick up. Moore's job is in jeapordy, but it's not lost yet. Not worth dropping him to pick up a backup.