Revis is 5'11". Size isn't everything and Browner's simply not good enough in coverage to beat out Dennard. He might get the occasional matchup play against a big receiver, but he's much more likely to be the fourth guy who's manning up on hybrid tight ends than he is to take playing time from dennard.
This signing is for Denver, because we will roll through the rest of the AFC again. Browner can man up on Julius Thomas, Revis on Demaryius, dennard on whoever ends up their two, and either Ryan or Arrington gets Welker.