You're asking whether it's Cam's fault for keeping the ball and running when he pulls it back from the RB instead of play calling and the answer is no. It's a called play called an "option", and more specifically a "read option". On the more basic read option Cam has the option of handing off to the RB or keeping it himself and the decision is a quick one based on how the defense has reacted.
I could go into a more in depth explanation, including our triple read option plays, but this should give you a better idea.
This is what I meant. Because this is the option this has stunt Cams growth. Did biggest play asset basically stunt his growth in the running game?