It might be that Andy got a nice "payday" with Alterra launching. Similar in spirit to a change in control deal when a company is acquired by another. Andy's job, as the GM of Squaw/Alpine may be just looking different down the road. More oversight. Bosses. In terms of a liquidity event, he may have gotten his money when this operation folded into Alterra, and the ownership changed. I'm just guessing that. Don't know when that happened, or if it has yet. But it's logical that he'd get a payday.
He also might be ready for a personal change. He's well thought of. These last five plus years may have taken their toll and not been a hell of a lot of fun. I don't see him as being "retired" for too long. Maybe he'll be a consultant. Maybe after some big money changes hands he'll join some type of competitor.
I wouldn't read too much into it. If I were betting, a lot of things fell into place and one of the downsides was that he went from running every single piece of his own show to actually about to have a couple more bosses. And being part of a bigger consolidated company.
Best of luck to him. Interested to see what's next, eventually.