Jon should get this overturned to a NC no question. I have always advocated this call and DQing Jon was BS.
There are two main issues I have with this scenario. One is about interpretation by the referee and the other is about the original call.
First, whenever there are fouls, it's always up to the interpretation of the referee and never consistent on how they're treated. Sometimes you get fighter who commits a foul and gets a warning, sometimes a point take away, and rarely is there a DQ. Sometimes, fighters will commit multiple fouls and they don't get a point and two warnings. 90% of the time, it's a warning.
For example....
1. Tatsura Taira threw 4 staright 12-6 elbows in a fight, all Herb Dean did was show him the correct way, not even a point.
2. Al- Hassan threw illegal elbows against Brungade, due to the shots Brundage said he cant continue and fight is ruled a NC.
So you have many different cases with different rulings. Jon threw 2 downward elbows in his fight after throwing about 30 legal ones and he gets DQ'd. But as I said earlier, 90% of the time it's a warning, 10% of the time a point, we literally have one scenario of a DQ. So if it gets overturned, I am fine with it considering hundreds of fighter commit fouls and didnt get DQd.
The other point is the origingal call. When this happened, Mazigatti told Jon he cant do that, it's illegal and then said "one point, one point, illegal elbows." The original penatly was to deduct one point. Then he sees Hammil who clearly didn't want to continue and asks if wants out. Fight is stopped. Based on the original call and how pretty much every fight was ruled when a fighter can't continue do to an illegal manuver, its a NC.
So if it somehow gets overturned. I am fine with it because all that does is it follows 99% of outcomes of fouls. Warning, point or NC.