there are many NFL QB who don't make that pass perfectly on every attempt. We even seen Mr Young attempt it many times and he has been low, high, behind, or too far in front. It takes time and practicing it over and over to get it right. Maybe he is finally starting to understand the art of throwing. Josh Allen didn't get better till his 3rd year in the league, and it was his 4th year it all came together for him. Even Drew and Baker weren't great QB's at the start.