I've always wondered this but there's just no way to prove it.
Does HB AWR have any impact what so ever when you are controlling him? Does the O-line get a RBK boost perhaps, or does it affect the effectiveness of Play Action perhaps?
We've had this debate in our PS2 leagues for a long time... I always felt that HB AWR DID something, but for the most part I was told that I was crazy
It would be nice if it had some type of impact even if you are controlling him.