I agree that hes not the easiest guy to project and there is some variability , a lot of variance, in his year-to-year end of year stats last 3 years. But he works out and he works out a ton, and hes 6'1
He has a better baseline than a 5'11 guy with no muscle. Not as many MLB players work out as you may think and people underestimate how much body matters to prospect readiness. Yes, you can in very many cases , look at a guy and tell if hes ready.
No boys. Roman Anthony is not a boy, I can tell by looking at him. Even in high-school, there are some 15 yr olds who are 6'3 and fully filled out and some 15 yr olds that are still children in appearance.