Cyborg does not deserve a rematch. She got run over in 50 seconds, it was decisive. I agree a rematch with Shevchenko but that wint happen since Valentina went down and Amanda went up. Other than that shes dominated everyone for the last 4 years.
we agree on Valentina.
++
On Cyborg, i believe that here case for a rematch is not justified by the closeness of here loss to Nunes, rather by here dominance in most of the previous MMA fights.
In other words Cyborg proved she was good in all here fights, and the last fight didn't prove she was inferior to Amanda Nunes.
23 fights
2 fights lost - the first fight and the last one with Amanda Nunes.
1 was overturned for a technical reason
20 wins
17 ko/tko
3 wins decision (none was split)
This is what i believe would deem a "right" to have a rematch.
And with Amanda, she didn't loose in a way that showed she was inferior.
So it is on the sweet melange of here previous invicibility AND the way she losts that would be a ticket for a rematch.
( i am not in favor of systematic rematches !! don't get me wrong.)
i would also add a "doubtful" win of Nunes over Valentina ... to add in the bucket and weaken the position of Amanda as an unquestioned champion ...
So by winning a second time against the Almighty Cyborg, she would seal it. IMO.
But actually, even if it wouldn't happen, Cyborg will fight another woman and then have a new shot at the title. In this circumstance, probably, Nunes would have had another fight and then would be back to touch gloves with Cyborg.
Finally, on a PPV, BIG MONEY !!! probably the biggest that ever took place on ladies.