I'm going to chime in here. The pictures you posted are ultra subjective. I am a 100% natty, always been, never will use, saw to many high level athletes close to me go down the drain and ruin their health, liver faillures, reinal faillure, cardiac complications, high pressure, high cholesterol not to mention fucking rage sprees ect....I can also tell you that in my mid twenties I did not have abbs like neither of these two dudes up there, had a 6 pack prototype but nothing like that. However I did have much bigger traps than the ''enhanced'' guy, I was at least as vascular but nut as dried out ( Didn't need to cut weight to show off, not my buzz lol...also i'm a HW abbs are pointless at 235) and I also had similar if not bigger delts than this ''enhanced'' dude. All this came by training like a had a mission. I didn't even use protein or any supplement back then. It was eating chiken, eggs, horsemeat (the non tainted kind lol) , spinach, greens in general and drinking water. No counting I ate until I was full and I ate when I was hungru period. (At that time it was all the time lol).
What I'm saying is some of us have the genetics to grow into our frame pretty good but mostly I think a looottttt of the people asking these questions about dudes being natural or not don't really train much or hang around athletes to suggest that these pictures are a clear cut ''natty'' or ''enhanced''.
I used to be able to handle 6 to 7 days a week workouts for Football rugby and boxing. up to my late twenties and I was always 100% natural, its normal, I was full of test from being young buck. in the 17-25 age I could eat anything and it would mostly shed off by working out hard every day and I would also bulk easily. Now I can still bulk and gain strength easily at 32 years old but the fat is not coming off easily at all anymore, normal, I'm not using and i'm slowly aging + Beer. Matter of fact i'm 30 pounds overweight atm and anything more than 3 or 4 hard training (Power lifting + Boxing) a week will ruin my body for days so if I really wanted to do something its all in the diet now. In my twenties, couldn't care less what I ate it would come off. GSP is a little older than me but like me his Diet was like mine younger, careless, because he still looked good. Now today he's eating right and doing everything right to gain mass for Bisping. He is also eating right because he had that Dad Bod going on for not stopping his bad habbits while slowing down the training in the past 4 years. ( I did the same and gained the mother of dad bods too after being some what a very big strong and lean HW lol)
Also there is the point of character. Its a big factor. Hanging around high level athletes, you can feel characters and kind get to know, who would cheat or not...You can always start sensing according to athletes values and thought patterns who is able to cheat and would do it without a second thought. I think GSP is not that kind of character, he has to much honor and to much pride in his honesty to do that. He is a no Bullshit dude and hates cheaters and like it or not when you pass your thirties you decline in alot of aspects except strength and mass for some reason it stays for a few more years... But speed, agility,cardio and being able to endure harsh training regimen, it slowly goes away without the special roid sauce. I think he initially left the sport because he was losing his edge slowly because he does not use and was competing against roided out cheats. I don't see him doing it as a character and I think he likes and took the Bisping fight because Bisping is not a cheater and he respects that and feels like its a fair playing ground (other than the 15 pounds he is giving but hell who doesn't like a challenge).
Bottom line, I think it is possible to look like GSP as a natural especialy when he was in his twenties, his genes are right, he trained like a fucking animal but not in a ''steroid abuser'' fashion. He did and still do Gymnastics, a lot of bodyweight training and alot of cardio. I've seen plenty of clean athletes reach that 160-190 ish supper ripped GSP look 100% naturally. I've also seen tons of others go from 150 to 190 in 6 months for the same ripped look and doubling almost tripling their weight room numbers. THIS is not normal and they had many of those character flaws that would make them cheat without a doubt anyway.
Now IF he was using, don't you think he would be trying to reach a walk around weight of 210?? How can he be roiding while struggling that much to get to 198 pounds! ??? He used to walk around at 190....he gained 8 pounds over about 6 months and shed away the Dad bod with a proper diet. I Mean roid users can gain 4 times that mass easily in 6 months. Again He barely gained 8.
NOT using.
Think about it.