All of this is true. Josh Allen, until he got to the NFL, had almost zero coaching. Brian Daboll and Ken Dorsey (I know everyone hates him now, but I think he did a good job working with Josh as the QB coach) taught him a whole lot about the QB position but he's still only been at this for 6 years. Lets take Joe Burrow as a counter example. Jim Burrow was the DC at Ohio University for more than 15 years and has been in the coaching profession since his NFL/CFL playing career ended. Joe Burrow is currently 26 years old, and he has been coached to read defenses by someone who designed them for probably 21 years. Payton and Eli too.