i remember rogan saying that hendricks lets himself get up to 220 sometimes, not sure if it's true though.
I think it was Hendricks himself who said he had to stop walking around at 215. This a tough thing for fighters to manage at any weight class. They all obviously start out at elite athletes, but after a certain age it begins to be more of a struggle to maintain that (as it would be for anyone). A lot of times they're faced with a tough decision: step up to a higher weight class, or learn to eat kale.