Mike Reiss of ESPNBoston.com notes that Welker only played 43 of 67 snaps against the Titans. That's 64 percent, down dramatically from the 89 percent he played during the 2011 season, according to Reiss. Welker had only three catches for 14 yards and a potential first down went off his facemask early in the game.
Welker basically split snaps with Julian Edelman, who took his spot in the slot on roughly one third of the team's snaps. The Patriots vary their gameplan dramatically from one week to the next, so perhaps this is just a blip on the radar.
Follow Gregg Rosenthal on Twitter @greggrosenthal.