Dealer finally got the engine apart enough to figure out what happened, claims a wrist pin broke.....

That's basically insane. Wrist pins breaking has to be the rarest thing that ever goes wrong with an engine and in 73 years on the planet in a family in which half of everybody works on, sells, or does something or other with motor vehicles for livings, I've never seen or heard of a wrist pin breaking. Certainly not in an essentially new motor...