Ya I forgot about having to break the chain too...
But back to the point, I have never seen or heard of a ZRX swing arm breaking like that, and I can't see any way to do it unless the pinch bolt was beat in with an impact wrench WITH the eccentric removed.
We have seen every ham fisted ape in need of having their tool box welded shut wander thru here in the last 2 decades, and as I said none of us have seen this before.
To the OP: the easiest way to break the master link is to take a dremel tool ( or any powered small grinder type tool) and grind the pins flush then push them thru, and then use a chain tool to replace the master mushrooming the pins.