Actually looked a little worse than that. I didn’t take too much time to examine it but that lower left pin that’s hanging off in your pic, had sheared fully and he said that the piston had actually jettisoned off into the valves and smashed into the valves. Complete write off according to him.
its the 3rd one that I have seen amongst my peers here, and all of them appear to have had similar causes. I am making an assumption in that but if you had to press me for a reason, it would be a seizure of the main crank bearing. Yours looks to be the same. Would you agree or do you think it could have been something else?
To me, it’s lack of lubrication on two surfaces not fit for purpose, gets hot, shears off through material failure on overheating. I could be wrong though.