As Maqman said, this is Jerry's 3rd time as a GM (granted AZ was very short time). I think a point often overlooked is that virtually Everybody improves with experience. When I left the Navy after seven years as a Lieutenant, I was much, much better officer than I was as a fresh newbie Ensign. A young Petty Officer who gets promoted to Chief Petty Officer often gets transferred also, as it is extremely difficult to go from being everybody's drinking buddy to their new front-line supervisor. They get a fresh start. The next time you are transferred (or next new job you get) you consolidate your experience and knowledge. Mistakes made in the past are learned from and not repeated.
I am very enthused that DiPoto has these prior years of experience and appears to have learned from them. It is very difficult to hire the next Gillick or LaRussa. But maybe we can identify someone before they become the next Gillick of LaRussa