>>11949205He wanted to stop at MGS2, but of course Konami was going to continue the series to make money, and they were having trouble making a good game without him, so he ended up helping out again so that the series wouldn't go downhill. This is a major theme in MGS2, and 4.
It's not ALL he's made of course. He also created Zone of the Enders, Boktai, Snatcher, and Policenauts.