The casa did not mention anything about a piston pin being damaged. They only found damage to the ringland and the cylinder was also damaged, and they think the PCV valve is faulty. Also carbon deposits were found on the intake valves and inside the cylinder itself.
I’m thinking maybe some of the carbon deposits on the intake valves chipped off and went into the cylinder and created detonation. As you suggested, an oil catch can will indeed help to prevent carbon build up. People are doing this to most ecoboost engines in the US, matagal na pala. I will bring this up with the casa, hopefully they will permit the installation and not void the warranty.
Curiously as I have researched, Honda’s turbo GDI does not seem to have problems with carbon build up with the intake valves... I think it has to do with the placement of the fuel injector.





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