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Former NFL quarterbacking great Rich Gannon worked color commentary for CBS for the Buffalo Bills' worst performance of the 2013 season, the 27-6 loss at Tampa Bay in Week 14.

Bills rookie quarterback EJ Manuel threw four interceptions in the game, two of which were his fault. He completed 18 of 33 passes for 184 yards.

Gannon is as astute quarterback evaluator. Here's his assessment of Manuel's injury-shortened rookie season:

"I think overall it was kind of a rough first year. The injuries certainly played a big factor. He missed a lot of time in the preseason, and I think that really hurt him. Then he comes back and has the five weeks before he got hurt. Even when he came back, I didn’t see the spring in his step. I didn’t see the confidence and the explosiveness that maybe you thought you had seen. And I thought you saw a guy a little bit tentative. It’s hard enough to play the position when you’re healthy. It’s almost impossible when you’re not. I think he’s got a lot of work to do in the offseason. The good news is typically you see a lot of improvement from Year One to Year Two. He’s got a lot of work to do."