I will say that it is humbling to read about several guys benching 400 while natural at a relatively young age. I guess we are all different. I really dont think a 400 bench with no AS was in the cards for me. My dad is 145 pounds soaking wet at about 5'6...
Anyways....
I will say that your environment (where and with whom you train with in this case) also plays a big role in your "development".
In the last 10 plus years i spent in Mexico working out in "hardcore gyms" (in different parts of the country) I witnessed only 2 guys benching 400 pounds and one of them was an american (and not a resident of mexico)... Very very rarely did I see guys benching three plates and/or squatting with four plates...
Now living in the Caribean's for over a year and working out in the "hardcore" gym of the island... Many muscular black dudes... some of them much larger than I am ... but havent seen anyone benching with 3 plates....
I think that this is actually nearer to the "reality" of most gyms.
A "no juice" 400lb bench at 200lbs (or less) body weight is not a common individual in most gyms IMO.