mod motors have some unique problems with ring seal. Thats why I was asking how the bores measured up. I agree it started with detonation. The issue is What cuased the oil contamination that lead to the fialure we see now.I gave the reason why it all started. It's up to the OP to check things like injector,valve springs,bore prep,rings,pistons,timing,ECU,plugs,etc..
I don't know how it happened but i know 100% when you burn a tip off the plug it's because of excessive heat in the cylinder. That is almost always caused by detonation..:smt023