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Nice write up. Yeah I have heard of something similar that most cars where the PCV Valve screws in there is a baffle/cover to keep splash up oil from going in the breather. If that splash guard breaks off splash up oil gets in the breather and dumps tons on oil. Old days the breather would just dump it on the ground which was dead giveaway (oil stains/drips every where you park) now it goes into the intake tract to be burned and fouls the intake and valves very quickly (usually before you can notice the problem). They newer direct injection engines really all should come with a dirty side catch can and emptying it should just be part of doing oil changes.
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