cooked it! What did I do wrong?

im not a turbo engine expert infact i know almost nothing about turbo engines but just looking at the pics i have to agree that from the scuffing just on the intake side it looks like a to rich condition that washed the cyl. walls down but that alone wouldnt have caused the prob I'm thinking possibly when the head gasket failed the coolant had to go somewhere and tried to hydrolock that cyl. and that was just the weak spot .