So....who is the backup running back?

The Eagles have one of the best running backs in the league in Lesean McCoy but who is behind him? Last year Ronnie Brown backed him up but this year on the depth chart the running backs who could possibly back up Shady is seventh round pick Bryce Brown, undrafted free agent out of Washington Chris Polk, and second year Eagle Dion Lewis. My take is that you will see come week 1 Dion Lewis as backup then I think its a toss up between Bryce Brown and Chris Polk. My thing with Brown is that with the college switching and all of that he never really played a whole lot of football. He showed some stints of talent with Tennessee but did not see much of anything in Kansas State. Chris Polk was one of the top running backs in college but a bad injury took him out of the draft, the Eagles got a steal in Polk as many teams wanted him but he chose Philly so hopefully he can show some good stuff at training camp and the preseason. Dion Lewis did not have a lot of playing time last year having only 23 attempts 102 yards and a single touchdown so he is in most people's eyes a unproven running back. Dion Lewis is not the guaranteed second back, I would not be surprised if  Polk (If Healthy) gets the nod now Bryce Brown is still a question mark for me I don't know what to expect out of him but we will see come training camp time. Now another question is how many running backs will Reid even keep on the 52 man roster, last year he had 3 this year he might be tempted to keep 4 but not likely. Final thought is that Reid will have a tough decision with a lot of great young talent that one he might have to let go but we shall see.