Originally Posted by Texans_Chick
When Shanahan Sr. talked about this, he wasn't talk about years in the league. He was talking about it takes 3 years for an experienced quarterback to get nuances of his system. It's a quote I found a while back when Shanahan talked about Jake Plummer coming to Denver.
I understand it isn't years in the league, but in this particular instance Schaub was already in this system for his prior years in the league and while there is no substitute for starting, having practiced and being coached on the system for three years has to be a leg up over starting cold.