It seems basically every fighter does, and has, cut weight. Maybe HW are only ones who do not... Example, Conor can cut to 155 easily. But when he fought Nate at 170, he came in at like 168 1/2. So he is a very small WW. Come fight night, he isnt putting weight back on due from cut. Where as Cerrone will be cutting to make 170. Yes they will both make weight. But some fighters put a lot back on after weigh in and come fight night.