It's the final stage of the cycle: start something, get traction, get acquired, wait for the lock-in to expire, leave. Rinse, lather, repeat. :-)

Note: I'm not saying it's a bad thing. Just that I would have been _really_ surprised if he stuck around for much longer after lock-in expired. If he did, _that_ would have been news. This was, more or less, to be expected.

I have friends who are on their 3rd iteration of this cycle. :-D