It was actually a broken humerus.
And I am fine with the current rule set. It has been hard enough to get sanctioned in most states. The human cock fighting stigma is slowly going too. All necessary for the sport to keep growing.
The refs do a good job overall, of calling the fights well. There will always be bad judgments, it is human nature to err. Would have preferred Silva was deducted a point for the violations of shorts pulling and rubbing the vaseline around. Could have changed the complexion of the fight if Chael had the 2nd wrapped up due to the deductions. Might not have tried that wild spin.
For myself, the judging is what needs overhauling the most. The reffing is usually about as good as you can expect for such a dynamic sport. But the judging is forked. Takedowns are given far too much weight, knockdowns too little, and most judges lack the necessary knowledge to understand when the guy on the bottom is actually winning.
Torres v. Mighty mouse was a prime example. Anyone that rolls knows damn well who was getting it done better, controlling posture, aggressively attacking, and avoiding the most threats. All MM did was lay there and defend subs. Torres was actively attacking, avoiding damage, and controlling MM's posture most the time. A guy should not have to expose himself looking for a sweep or escape just because the guy on top is somehow thought to automatically be winning. Particularly when you are very nearly sinking subs and have a good attack game from guard.