SGibs and Zfarls, the guys behind the Prima guide, said on their YouTube show that BCV affects user controlled players too. They said they asks the devs and that is what they were told. They were told it helps the RB go throw holes better for you. They avoid defenders better.
I was told by a dev that Awareness doesn't matter with user players. I don't know though. It's seems some QB's have better ball placement on passes when I don't lead pass than others. The elite guys through it away from defenders better. That might be one of the accuracy ratings though.