The kid just has the mental make up to be a great qb. That along with the arm that most analysts were touting in camps. I think it's important to remember that he didn't get that off season work as he relates to early in the video. He was thrown into a no-win situation last year as has been touched on by lots of posters and media. I was worried it might damage his psyche (and it may have) but hopefully he has put in the work and this year he can silence some of the naysayers.
Sorry that the video is related to the KC Star. I understand they aren't the greatest or most unbiased journalists.
https://www.youtube.com/watch?v=18BpCsz9tXM