Read what Stewart said after the Nova game. Seems like he continues to learn and develop. He obviously has talent and tremondous strength.
"The thing is you don't want to surge up on him real quick because as soon as you bite down there's going to be a guy open," Stewart said. "I know there was a time I wanted to go after him, but I knew there was going to be a tight end or a dragger behind me so that's the type of player he is. You get picked a little bit with a player like that. Coach [Bob] Diaco is always talking about playing fundamentally sound and doing your job and honestly that's all it takes. I know I made a couple of mistakes I could get better on, but you learn from it."
This might explain some of Robertson's runs. I was impressed by his elusiveness.