In most cases I would say its just heavy fluid from the amount of HGH guys use these days,timing is a real issue with it pre contest, some people take a week others a month to get rid of the fbloat and fluid. Guys would be blasting 20ius a day coming into the Olympia,like when that photo was taken, and the Jins would put your hands to sleep on 4iu, its a real personal thing though, like anything self experimentation needed to see what works for you.
The kidney thing is more than likely obvious in bloat post comp, Both Flex and Don long, 3 days after a show would look total off season, I remeber flex putting on something like 30 pounds in a few days,which isnt uncommon but a lot of guys just look fuller and more vascular, definatly some bloat, but with wheeler and Don you could tell something was wrong, they had a full moon face overnight, and their physiques were just drowned in water.