I suspect Andrew Morton and Ted T'so have unique arrangements with Google. In fact, is OSDL actually still *funding* Andrew Morton? This article -- http://www.linuxtoday.com/developer/2006080303126NWCYKN -- says that OSDL was funding him and Digeo was just providing him an office to work in so that he didn't have to work from home, and that once he joined Google "His relationship with OSDL is unchanged.".
I know a couple of Free/Open Source hackers who have disappeared into the google black hole. It makes me sad. Not only do they stop contributing patches to open source projects, they also stop blogging and otherwise just disappear from the Net.