I remember Joe Rogan talking about that one time. Fallon Fox, a born man, who became a transgender woman, had entered a woman's division and ended up fighting two women and beating the shit of them before anyone realized that Fox was born a man And it was incredibly obvious that all her advantages were biological - in terms of technique she was lacking compared to her opponents.
During Fox's fight against Tamikka Brents, Brents suffered a concussion, an orbital bone fracture, and seven staples to the head in the 1st round. After her loss, Brents took to social media to convey her thoughts on the experience of fighting Fox: “I've fought a lot of women and have never felt the strength that I felt in a fight as I did that night. I can’t answer whether it’s because she was born a man or not because I’m not a doctor. I can only say, I’ve never felt so overpowered ever in my life and I am an abnormally strong female in my own right,” she stated. “Her grip was different, I could usually move around in the clinch against other females but couldn’t move at all in Fox’s clinch…”
I looked around a bit, and found a few instances where it sounded like some transgender scientists/doctors were saying that there should be no biological advantage after hormone therapy and all that. But I am extremely dubious about that claim, and think it's more likely they have an agenda to push.
Trangender UFC I might start following the UFC just for that