I would think that as CTO he would have at least 1% equity [1]. If that's the case then he has increased his net worth by about $20m.
<also pure speculation>
[1] http://www.askthevc.com/wp/archives/2007/06/what-are-typical...
<also pure speculation>
[1] http://www.askthevc.com/wp/archives/2007/06/what-are-typical...