Tell that to Sam Bradford

Btw, Trubisky is not a running QB in the true sense. He is similar to Aaron Rodgers, Patrick Mahomes or Alex Smith. He uses his legs to escape the rush and rollout.

First and foremost, a QB needs to have arm talent. After that, he must read defenses and process that info at a very fast rate. Being mobile is never a liability, nor is running with the football in a smart manner. It's QBs that run too much that are more susceptible to injury.