To be fair to Arnette, he's pretty good on the screens and outside contain (minus getting sucked in by the Maryland RB). I can think of a few screens he's blown up single handedly while being blocked. In that way, he reminds me a bit of Roby... but with none of the coverage skills unfortunately.
Sheffield... I feel like he's always with the receiver, and still they usually make the catch. He's too passive ? I don't know. Arnette is who he is, but can't help feeling Sheffield could have been an NFL player (3rd-5th rounds?) with better coaching.
I haven't been that impressed with Wade and Okudah so far. Seems like a case of "grass is greener" to me. Seeing a lot of the same as Sheff imo... they'll be there, but the WR will either make the catch anyway or a PI.