Some fighters are really dumb with the amount of full contact training they do. I watched the countdown episode of one of the recent UFC events and I couldn't believe how hard some of the guys were fighting in training. I can't remember who it was, but one of the heavyweights was doing a sparring session with one of his training camp guys and if it hadn't been for the pads they were wearing you could be mistaken for thinking it was a real fight. Surely take things down a notch, particularly in the final few weeks before a fight?!
Fair enough if it's a muscle or ligament that you damage while moving awkwardly in training, but breaking a bone can't be down to anything but not training smart.
edit: respect to Connor if he still takes a fight. He's got more to lose now that RdJ has pulled out.