He had his ups and downs today, but they came in relief in a game he got zero starter reps during the week for. That was a lot of pressure he shouldered and he didn't wilt.
With Taysom Hill likely out at least another week, Simien is the guy. He should be better after a full week of practice and a game plan designed around him. Things get a lot easier for the running game next week as well, and that should open things up.
I'm not predicting Simien becomes the long-term answer, but he might surprise us.