If you wanna see what he looks like at 65kg, check out a weigh in from a featherweight bout. When he comes in for weigh-ins (for featherweight anyway), he is usually incredibly dehydrated. On fight night he usually comes in far heavier, apparently on the day of the Aldo fight he shot back up to 174lb (78kg) if memory recalls lmao.
He usually walks around at 77kg btw, but google probably has his weight at 77kg cause his last fight was at welterweight, and his next will be too. (Cause he lost and is looking to avenge the loss)