I hate to say it but teaching a quick release is almost impossible as that has to deal with changing how quickly a QB can read a defense or gain confidence in throwing to a spot vs a player. Sadly I think Josh never learned the skill of throwing a receiver open in part because with his great arm he can get it there so quick he doesn't have to. So he might never learn this skill but hopefully he can play more like he did against Dallas than say against Houston to play to his best.