Aren't there like 4 other Turing award winners at MSR that also somehow escaped poaching (and are there any at Google)? I think you may have the wrong idea about where researchers would prefer to work...
Off the top of my head, there's at least one Turing Award winner at Google: Ken Thompson.
They have certainly successfully poached a bunch of awesome systems people from their positions in academia. I'm not sure how many from MS Research though.
