Maybe they have some genetic condition where they don't respond as well to drugs, i can't think of one IFBB pro that was ginger, correct me if im wrong
Some gingers can get big as fuck but it seems they can never reach the competitive bodybuilder level.
note: no im not ginger, i have brown hair.. just for some reason when my hair was longer people said it looked like it was going red in the summer, my facial hair has alot of red in it ... and my pubes have a ginger tone to them when they are long lol. I think i may be carrying 1 ginger gene from great grandparent but you need 2/2 to be ginger since it's recessive so im ok lol.