Rollin and Cinnamon left Mission: Impossible for a variety of reasons. The first reason is that they were both unhappy with the direction the show was going in. They felt that it was becoming too formulaic and predictable, and they wanted to try something new. Additionally, Rollin felt that he was being typecast as the nerdy guy on the show, and he wanted to explore other acting opportunities. Finally, cinnamon simply got tired of working on the show and decided to move on to other projects. Whatever the reasons, we're sure they had their reasons!