The big takeaway for me is how much work both guys put into it. They each found a system that works, and they RELENTLESSLY work their process. They don't stray. They don't waver. They don't try new things. Early in their careers they were trying new things in order to develop their system, but once they locked on, it didn't change much.
I believe your success as a hunter is directly related to how fast you learn, and how hard you work. At the same time, a hunter must be realistic about what "success" means in the area. If my definition of success is to kill a P&Y every year, I'm going to be a loser most years in Southern GA.
If I lived in parts of the midwest, a P&Y every year would be a realistic goal.