Didn't you guys read the $uck$ ball$, Mike lost money to Fort Minor we all know that money really matters in the Linkin Park camp, he would probably stick to the economic comfort that LP gives, also he did FM because he couldn't use all of his Hip-Hop influences with LP (see MTM era) with the post ATS LP he can do whatever he wants.
http://www.blabbermouth.net/news/linkin-park-rapper-losing-money-on-solo-project-s-tour/