From the limited studies I’ve seen, and from the comments by others who may have seen studies I have not, the question of whether hyperplasia can be induced without drugs is still an open question. My point was that if we are not sure if its actually occuring at all without chemical intervention, we can’t jump to the conclusion that it will or won’t happen more readily within one group, because we still don’t understand the if, much less than how, why, where and when.
If it does occur, it may be as you’ve postulated, that the extreme difference in stress that might be required can only occur in untrained individuals. Or, it may be that only an advanced athlete can train at the intensity levels required to stimulate the process, if it does in fact occur.
My point is, we just don’t know if hyperplasia can be induced in humans at all, with or without chemical intervention, so it is very premature to state that it is more or less likely to occur in one group or the other.