I do believe people can have genetic which are either positive or negative in different aspects of bodybuilding.
1. Size and strength (physique symmetry also)
2. Ability to process food, supps, drugs.
3. Structural longevity.
just to name a few....
Just because you have one doesnt mean you will have another.
For instance, a huge monster (mesomorph) can have injury issues.
Another huge guy may not.
An endomorph can have strong structural characterists.
I was a small person who tended to retain bodyfat. I worked for every ounce of muscle and strength when with others it came easily. But I train heavy as possible 52wks a year with loose form. At 54yo, Ive never had shoulder, lowback, knee issues. I had some tricep problems in my early 40s. Of all the things I could have wished for, this is what Im grateful to have. At my age, I just keep going. guys 20yrs younger (example - a 34yo ex-professional football player for 5yrs who was my training partner for 4-5yrs) who is freakishly strong, but has many injury issues... while every workout, I lift heavy (5reps on my heavy compound sets) with little problem, and I am grateful to be able to just keep it up. Hope it stays that way...lol...if I need to adapt I will. For example, on Chest and Shoulder presses and squats, I have made some changes-I now use the smith machine. But heavy as possible! And my form on some heavy sets is not pretty.
Ive met Lee Haney. He is the most humble, kind, and friendly guy youd ever want to meet. This guy would be a #1 bodybuilding role model for the public.
He is genuinly pleased that you take the time to talk to him, instead of the other way around as with most persons of fame. A true great person!