Not sure if you are attempting to be funny again, but I said nothing about the USA's potential at soccer, and it's pretty irrelevant to the topic. Except perhaps that we could both agree that the USA would 'smoke the rest of the world' if soccer was as big in the USA as elsewhere, and the reason primarily would be that you have by far the largest population of West African descent citizens, and soccer is indeed, contrary to what others are saying here, relevant to the ability to run fast.
As for your relevant last sentence, that's just your opinion which seems to be based on nothing, and which is completely contradicted by Sedjuti. If it is the case that he was a soccer player until 19 or 20, then why was his 1:41 ability not spotted earlier? With all the thousands of pro soccer players in Europe, it just so happens that the only one with 1:41 potential is an Algerian who didn't quite make the grade? And despite there being a proven case of one soccer player having the talent to be the best 800m runner in the world and possibly break 1:41, then only a handful of other pro soccer players in the world out of thousands had the potential to break 1:45?
My point about Kenya and soccer players, which you ridiculed, was that it would only take 2 or 3 soccer players in each major European or South American country having world class 800m potential to completely rewrite the notion of Kenyans having any 'special ability' for the 800m. No world class Kenyan 800m talent is lost to any other sport. There are no professional sports in Kenya (or Ethiopia) than running. It's absurd to think that in the UK alone, with thousands of professional sportsmen in other sports, that no more than 1 or 2 would have the potential to be a world class 800m runner.
Another example is Josh Kerr and his brother. His brother is a professional rugby player who has represented Scotland. Again I was ridiculed a few years ago (perhaps by you) over the idea that there could be world class runners lost to sports like rugby, or boxing. It's a bit of a stretch to think that Josh Kerr simply had genetic talent for running the 1500m and nothing much else, and his brother only had genetic talent for playing rugby and nothing much else.