The difference between something like height, and something like running ability, is that it takes no particular effort to be however tall you are.
Nobody has the ability, without any training, to run a WR time at any distance. Your argument assumes that a statistical outlier in terms of time will also be a statistical outlier in terms of native, untrained ability--which is an unsupportable assumption, since training and motivation play such a big role in an activity that requires a decision and effort to undertake (unlike the passive attribute of height).
The idea of a WR-holder being "a natural" is most commonly held by their competitors, or by previous WR-holders, IMHO as a means of self-justification, that they did all they could but could just never be as good, because somebody else had a "natural advantage" that they lacked.
You hear this all the time with Bolt. Take MJ's comment, for instance, that there is basically nobody else out there like him. However, even MJ qualified that by saying that there might be "somebody out there in the jungle somewhere" who could match Bolt in terms of native ability.
The chances of an individual who was a statistical outlier in terms of native ability, actually having the opportunity, health, training, facilities, support, food, competition, and drive to be a statistical outlier in terms of performance, are not great IMHO. Yes, I understand the selection effect, but it doesn't mean much to me, because the selection effect would apply to many athletes. Obikwelu was a product of the selection effect just as much as Bolt, but never ran 9.58
Bolt is particularly interesting to me. If one believed my above logic, IF a natural statistical outlier was given every opportunity, one would expect performances that were absolutely off-the-charts--I mean generationally untouchable.
9.58 is that performance
I can't think of any other performances like that by any athlete that has a chance of having been clean, except for maybe Komen.
Bolt, and Komen.
Radcliffe? Not so much, but possibly.