Peyton Manning says he's healthy -- but he's also 39, and no one can play forever. Historically, when quarterbacks hit the wall, their completion percentages go down and the interceptions go up. Might Manning forestall the inevitable for another year? Sure, but the odds are starting to stack up against him. I also wouldn't dismiss the loss of Julius Thomas; he's a very good tight end. What was once a supercharged receiving corps has lost a fair amount of firepower over the years, with the departures of Thomas and Eric Decker and the decline of Wes Welker (who remains unsigned). I'm interested to see how No. 1 receiver Demaryius Thomas responds this season. It'll help if Emmanuel Sanders can repeat his off-the-charts performance from 2014.