Yes, curiosity is why I posted this. I suppose it's possible some champions could do this but hard to see anyone in the UFC outside of maybe Conor who has that kind of leverage.
Aldo is a perfect example. He never got a rematch and he was a dominant champ and many people thought Conor's win was fluky enough to deserve one.
I also found this old article talking about Anderson Silva's rematch with Weidman and the fact GSP was never promised one.
https://www.mmaweekly.com/dana-whit...e-an-immediate-rematch-if-he-loses-at-ufc-167
Also saw an ESPN article about Jones when he turned down the short-notice fight with Sonneon. He had no rematch clause in his contract. Reporters asked if that would have made a difference in his taking that short-notice fight. He said no but I thought it was telling that he didn't have one.
In these cases even those dominant champs had no guarantees other than Dana's whim and nothing was contracted.
The reason I asked was I was watching lastnight's fights with a friend who seemed to think Pena would get another rematch based on nothing more than the fact she was champion and her contract would guarantee it. I've had the same argument with him before when he insisted Stipe would get a rematch with Ngannou. We all know he went on to fight Gane and Stipe has never been guaranteed anything. I told him the UFC is not boxing where champs try to get rematch clauses in their contracts. He then went on to basically call me a know-it-all and "whatever" and he will continue believing what he wants. He used the talk of another rematch in the cage as proof that he was right. lol