I believe all this talk about Brock's dramatic improvement in mechanics and stuff is overstated. Just like any other NFL QB, if you put Brock on a team with a solid Oline, a serious running game, and very good receivers, he's going to shine.
I've been impressed with how he is spreading the ball around the field, and making it through his progressions. In college I thought he would lock into a target before the play started and it would be why he made mistakes.
His accuracy was elite in college and that is showing through in the NFL. It was easy to not appreciate just how many of the "routine" throws he made.