re: What does Welker do to D. Thomas value?

Essentially, it makes the offense better but it doesnt improve Mannings value very much. The Broncos love sitting on big leads which doesn't give you the 300+ 3TD like Brees and Brady. Mannings best fantasy games last season came when they were behind in the 2nd half.

Brees and Brady rely on the pass to set up the run. John Fox is a run first type of coach.