I dunno you might get some good value out of a Rematch. There were a couple of mistakes Gina made, I defintely don't think she should have stood back up when she had the full mount, it was clear from the start that Cyborg's power was way more than she expected standing up, and as you have mentioned and from all accounts Cyborg wouldn't have had the best gas tank. Hell it looked like both of them were knackered towards the end of the first. Should have tried to have kept dominance and worn cyborg down when she had her there. I wouldn't mind watching a rematch anyway.
Where did you watch the PPV anyway mate? I managed to find a stream of Cyborg and Carano online but I don't think the actual show itself was shown here in the UK. Would like to see Mousasi in action, have heard a lot of good stuff about him.