That piston has done that due to either oil contamination causing det, or through too much advance or through not enough fuel.

Too much advance or not enough fuel are mapping issues.
oil rings failing due to bore wash and allowing oil past is a mapping issue if thats killed it
head gasket overheating and allowing oil to leak into the chambers could well be a mapping issue too

So whatever the reason for failure, there is a high chance a decent map could have saved it, either that or its just tht the engine is worn out through too many miles.