I definitely agree. He has some crazy natural athletic abilities, namely his arm strength, and speed, but he is raw. Like you said his mechanics need some work. He needs a quicker release, and needs to show he can work through his progressions. imo this is what dooms most quarterback. In HS they don't get exposed because usually the first, or second option is available. His highlights are mostly 1st or 2nd read hits. Let's hope he will have the ability to remain calm, move around in the pocket, and go through his progessions.
And obviously he needs to put on some bulk. He looks to be on AJ's level in terms of frailness.