Hey Stunt, by the way the Russian looks pretty fuckin good man! all of them by the way.
Anyways to help answer your questions. Many guys are sucking down to make weight for a certain weight class . Some are using diuretics or not drinking or eating for a while. At the weigh ins most are looking quite flat which makes you look less conditioned , since your muscles are not pressing against your skin and since your not pumped and less vascular leading to a less conditioned look.
At the weigh ins if you want to know who probably is most conditioned focus on their bodyfat, how thin their skin is. Key areas include: their legs, back of legs and lower back and abs.
After the weigh in most guys are eating like crazy to fill up. Some guys even stay up all night eating because they are so depleted. They put on their coats of tan, eat like crazy, get a good pump and when they walk out on stage they look like totally different people. Hope that helps