Canonical should grab him for Ubuntu. Even if he was only there for a year, it would be a great transition for him. If things didn't work out, he could always just say the company wasn't ready for him.

However, if it worked, Ubuntu could take over Windows for the enterprise in only a few years. Now is the time to strike while the iron is hot.

Of course, they couldn't pay him all that much but the upside is tremendous.