I've seen many failures in late model bikes. Catastrophic gear box and roller bearing failures etc. Most if not all once the engine is pulled apart and the pump found to be ok they are just cleaned the failed part replaced and are just fine.
Pressing the crank apart to see if the filter didn't work seems over the top. You can pull plenty of stuff apart to check for wear that is easy to access. If it doesn't look new at those hrs then you may consider shit it the oil has done it and I'm thinking it would be uneconomical to repair. But why would a valve train wear. Excessive load on it may wear the bushings. Tight guide or incorrect valve springs ????. I would be having good look at the cam as well. They are nitraded so at a guess maybe two thousand of an inch deep and then it's cheese. The lifters have at least 2mm of hardening on them. If these are fine then I don't think you have much of an issue.
Lyndon