While I hope he stays with SS, hasn't he been with them since 2004? 9 years is a long time. That's his entire professional kiting career so if he decided to try something else out that might just mean it's time to move on. There doesn't always have to be dirt about one party or the other.
Len10 isn't really out there competing in events and he doesn't ride the kites that SS sells in quantity. So, you really have to put a price on how valuable it is for SS to have the megaloop king on their brand? How much is that worth? If they decided to cut Len10 they could probably sign up 4 up and coming groms for what they are paying Ruben and will have a much wider reach in the market. If they choose wisely, one of those groms could be the next Ruben or Ben Wilson.
$.02