Of course kyomu is a natural bodybuilder. Nothing special or freaky about his body and thats normal for all Natural bodybuilders, typical physice of a guy who consistently works out with decent genetics.
Only people who don't believe that kyomu is natural are
kids who just started bodybuilding and to them everyone with little bit of muscle look huge
Bitter guys with horrible genetics who think anyone who has just little more muscle then them must be on juice.
Lazy guys that never lived bodybuilding 24/7, therefore have horrible physice yet at the same time they accuse guys who live and breathe bodybuilding 24/7 of being on juice.
I know of few guys like that. They accuse of guys juicing even tho those guys dieted for 4 months, never missing workout, never missing a meal. While at the same time other guy only eats 2-3 times a day (crappy food) and works out only 2-4 times a week with little to no cardio.