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That last bit is quite deep but let us not forget Merckx was a doper. But I do agree: accidents at a DNA level over millions of generations gave us us, and accidents and so evolution continues to occur. Firmly believe in genetic freaks. Humans don't stand still evolutionary speaking.
Jimmy_Fingers-
Humans don't stand still evolutionary speaking
They've been parked for a long time now. Don't confuse freaks with populations, or epigenetics with genetics. Large populations and rampant miscegenation (sapiens couldn't even keep his hands of neanderthalenis, or vice versa) makes any substantial population wide evolution unlikely for the time being, but outliers will always occur and technology (training and nutrition) can reveal human potential which was always there but not previously expressed.
gbj_tester
I used to be on an American forum. When Wiggins won the Tour they were all going crazy, saying he came out of nowhere. No Americans had any idea who he was, therefore he "must" be doping.
Froome might be a freak of nature who never had any decent coaching. Once he got proper training, bike fit, team support, he was able to perform.
Merckx was asked "Where is the next Merckx?" He said there could be lots of them, but they are playing basketball or soccer, or have no interest in sports at all. There could be someone with the potential of Froome working right next to you, but they had no interest in cycling.