With regards to the salesmen and their business propositions, it doesn't sound like stolen data. Sounds like he played the role of company-man and threw people under the bus for the good of the company, believing that he would benefit in the long-run.
One of the first things I learned from the old engineers at Lockheed was to identify and actively avoid the company man. You interacted with the company man at your peril. It was basically like this: in dealing with a company man, anything you say can be used against you, but nothing you say can help you.
Unethical behavior is a funny thing. He would have been better off in pretty much every way had he taken one of those "bad" salespeople up on their offer to start a new venture.