Sure. My view is that Rose has done a very good job of making a name for himself and translating that into personal wealth. It is not clear that that adds anything to Google and if Google thinks it does then my view of Google is diminished.
There are loads of reasons why someone would rather work for Big Corp. than doing a startup, especially when they've already checked "build a successful company" off their bucket list. I can only speculate, and I don't feel it's right to in what was probably a very personal decision.
I mean, is that a good way to "leave a legacy"? Why not keep trying on Milk?