Payton left because after he went back home to visit his family, they were hit with some very heavy news concerning his mother. So he left to work on his career closer to his family after realizing how important they are.
He also said that “It’ll be hard not being involved in MGS5, but I’ve got the utmost confidence that Hideo Kojima, Ken Imaizumi, and our amazing team will put together another blockbuster game. I’ll be cheering from the sidelines.”
We wish Payton luck on his next career!