I guess there is still hope that Treadwell will develop into a useful WR. Not sure about anything more than that. We also have Floyd on the roster this year. I'm not sure either of the 2 rookie receivers were ever active, maybe Coley for a game or two. All those guys combined did approximately nothing.
As a rookie CP managed to score, what, 9 TDs. 2 of those were by returns. 7 came on receptions and runs. It's hard to believe Musgrave was the OC genius that figured out that if you get CP the ball a few times a game (hand offs and screen passes) he can make things happen. This year, nobody on the Vikings has more than 8 TDs (I know Keenum has passed for more). CP is also a really good ST player. He is worth a roster spot at the right price.