Welp, Burrow wasn't a great QB until Brady got there, not saying he is the only reason but he was definitely a factor.....and Allen's turnovers are way, way down in Brady's 1st full year as OC in Buffalo (6 INTs, after 4 straight years of double digit INTs), in fact he is having his best year.....but I'm sure that is just coincidence....
Also I'm sure the Bills thought lets promote Brady to OC because he is not the best driver.....what a bunch of hogwash....