He would really have to impress a lot of people, because the guys that win the sixth man award normally score a lot of points, not rebounds, blocks and energy. Barbosa, Mike Miller, Gordon...all scorers. I doubt he will get the recognition in his second year unless he can really come out like he played during the summer league, stay healthy, and not get in foul trouble early in the game.
My vote would go to Noc right now because he's shown more and could easily average 16 ppg this year. Although I think Thomas will be more nba ready this year it would be too soon to expect him to be a sixth man.