I think Josh can do it but he'll have to
Become a master of Dorseys offense. Know the playbook better than Dorsey.
Recognize defensive coverages and disguised defensive coverages (cover 0, 1, 2 and 3)
Be able to audible to a better play (see step 1) once he does step 2. Audible from a run to pass or pass to run at the very least. How much audibling did Josh do last season ?
Move his RB around for better blocking once he recognizes the blitzing LB. The Mike, Sam, etc
Running is a result of the play breaking down at the last second and not being able to change the play or not recognizing what the defense is doing.
Steps 1-4 is how immobile QB's win superbowls.