Do rookie defensive backs count?

Without knowing how the depth chart shakes out in the secondary, I can't pick one yet. Could be any of them.
I'd like to see Aldrick Robinson used to his fullest potential as WR and on returns. He's my offensive choice.
On defense, I'll say Perry Riley. He had great numbers last year but I think he'll improve even more and become one of the top LBs at least in the NFC East. With Orakpo and Kerrigan back on the field together and demanding attention, the other LBs will have better matchups. I say 6 sacks, a ton of pass deflections and he'll get his first career INT.