His arm mostly looks fine in that video. His footwork is EXCEPTIONAL. He is patient, decisive, accurate, and tough (he took a few big hits in order to complete passes). His ball placement mostly perfect. Based on that game alone (which is a bad idea), he's the perfect type of QB to run Dennison's stretch offense, because he's mobile (enough) and excels at play-action.
This dude is going to surprise some folks, I'm telling you.