I love these comments and there is great wisdom in them to learn from. However, I've experienced exceptions to many of them. For example, the buck I killed this season, we had no daylight pictures of him. One hunter did, but naturally he kept that secret. The first buck I killed, I had no picture of him at all. I believe he avoided the camera which was only 150 yds away from where he was shot.
All I'm saying is this. Every mature buck is an individual and while they still have the same needs and drives as any other deer, they are individual bucks and must be approached that way. Rarely, do you kill a mature buck the same way as another. It does happen sometimes. More often it's at a different place and time. The circumstances are different and then you say oh that's how it's done. Then it's different next time.
Use your experience but be flexible depending on what the buck is doing and what your instincts are telling you. Be persistent and flexible. Be aggressive when necessary and also be willing to back off. There are times for both. That buck doesn't posses super intelligence but he is more wary than we give him credit. That's why he beats us most of the time.