Adalius Thomas was a head scratcher as a scratch on Sunday vs the Titans, and as the Boston Globe points out, there still is no real reason he was not in uniform:

The mystery behind Patriots linebacker Adalius Thomas and his being on the inactive list for Sunday’s game didn’t get any clearer yesterday. Thomas was a healthy scratch for the first time since his rookie season with the Ravens in 2000, missing the 59-0 beating of the Titans at Gillette Stadium. He wasn’t on the injury report all week leading to the game and was not at the stadium Sunday, according to a league source.