Given how his physique exploded, Colemans natty claims are more credible than most. Also look at his delts there vs his juiced era.
Young Kai is another with solid natty claims.
Yes he had amazing, one of the best genetics ever, but your logic is flawed.
Arnold started juicing from age 15 but he kept gaining muscle for 5 years, he went from 160 or so pounds to 235 pounds.
Ronnie's definitely juiced to the gills there! he just kept up the dose and maybe added GH later.
Just speculating here, I imagine he would be very lean and muscular (8-10% bf) 210-220 all natural, which is out of this world genetics.
At above picture he seems at least 240-245 at 5% bf, no way naturally possible!