When Russell was first drafted all I heard from the so-called experts is that he was too small to be successful. I too bought into that and thought he would be a Seneca type backup at best. What these "experts" and I for that matter didn't realize (outside of his incredible leadership skills and professionalism) was that what seems to hold many small QB's back is not the height but the size of the hand. Russell had the largest hands of any QB coming out last year (bigger than even 6'6" Osweiller). When you have that much hand and control on the ball you can do just about anything you want. I do not have a large hand and have trouble throwing a regulation size ball with accuracy and velocity. When I pick up a smaller ball to throw I feel like I can put it anywhere and with much more speed. This is what many did not understand with Russell. It's the hand size that holds most of these smaller QB's back not the height.
The reason I mention this, is to this day I still here many analysts on tv talking about his height. Maybe if they did a little more research they would see there is more to it.