Wow, that’s pretty messed up! It looks like some little bit of metal or something else hard got in there and danced around for a while. I’ve had that happen before, it was a small piece of the big end bearing cage that did the deed. Not so lucky with the cylinder though… could you have swallowed a tiny rock thrown up from the track surface? Doesn’t seem likely, with the filter inside the airbox. Take a close look at the ring…anything missing? Good luck, hope you figure it out before next rebuild hits the track!