Per Brett Okamoto: "For UFC 259, Joseph Benavidez has been working with Shane Carwin in an attempt to get better at cutting height for his upcoming bout against Askar Askarov."
According to Sherdog, all differences in fighters appearances can be justified by lighting and angles.
Joseph Benavidez is a very interesting study... Obviously a real badass alpha who can destroy 99% of the human population with his bare hands. And is relatively wealthy I would assume, and has a super hot woman. But seems extremely sensitive and psychological insecure. Didn't he say something in the past about how it sucks to be the height of an average teenage girl? But this is just from an outside observer, catching him at his worst. Maybe 99% of the time he is super confident and happy.