Just got back from picking up my two gold crash bar bolts from the local BMW wrecker, who has been working on K's & R's for 30 years +. I asked if he had heard of one bending and breaking a con rod, his answer was never. He has seen a couple do big ends from lack of oil, but even then they have never thrown a rod. I asked about if a blown head gasket could have done it, his answer highly unlikely. He said it might have been apart and assembled with damaged parts, but I can't see how. He did say that given the Bricks reputation you were highly unlucky, if that is any consolation.
Regards a perplexed Martin.