Actually, Schuab in the Denver/Kubiak system is the guy who does not fit. With all of the bootlegs, rolls and play action a quicker QB with at least average mobility is the norm. The Denver system comes straight from the 80s 49ers with Montana, Young, Elway, Plummer. Even guys like cutler and Greise were at least average runners.
Link to how direct Shanny/kubes are to bill walsh.