Do elaborate from ur side, you will need a video-clip evidence to prove the events occurring that moment. A picture can be looked from thousands of perspectives and, any person caught doing something wrong, gives the impression of catching it coincidental or just lucky for the reporter. To prove an airbase existing in the time when this happened you'll need a demo, not a screenshot. There could be many reasons why he was in that place, looking there or here.
As for chat logs, you don't need a demo. So the offense done to you, recall being ignored isn't a serious problem then him doing airbases. He would just get a notification to listen to players and that's all. No big demote or suspense LOL
And the other part of my opinion is that kevin is an oldie in ambrosia and has a good reputation coexisting with the rest bb players.