One thing Coleman's purchase indicates is that there won't be any big news/partnership/M+A in the near term, since for him to buy stock ahead of a deal announcement would amount to insider trading.
Concerning insider ownership of stock, I remember several years ago Cortex instituted a requirement that all senior management had to own a certain amount of stock in the company. I no longer have the specifics on that rule, but it's possible Coleman's purchase may have something to do with that. More likely though, he may just see the stock as a good buy right now.