McD had a defensive coach mindset who believed the key to success was to minimize turnovers, slow the game down, avoid risk. That has led teams with lesser QBs to championships and helped turn the Bills into perennial contenders. He also deserves credit for changing the culture and for helping Josh be a less reckless version of himself. However, that mentality creeps in, and instead of believing you will make the play to win a championship, you end up fearing making the one that ends your season. Brady is the next evolution. He understands fully the greatness of Allen and has no fear unleashing him. He has removed the restrictor plates. He understands the reward in doing so outweighs, by a large margin, the risk. When you have a player like Josh Allen, you have to do more than trust the process and minimize risk, you need to believe in the greatness and buckle up for the ride of your life.