Jake Peacock believes that physical skills can only take fighters so far at the elite level.

According to him, the real separator exists between the ears. Mental toughness, strategy, and the ability to stay calm under pressure are what truly distinguish top fighters from the rest.
https://www.sportskeeda.com/mma/news-it-s-mentality-stage-jake-peacock-says-ultimately-mindset-separates-competition-one