You compare runners against their own era..
Yes, Thats the reason why Bannister only did a sub 4:00 in 1955 and Snell smash that chrono and put a new mile Wr in the map. But why John Davies also coached by Lydiard himself did run in tghe same olympic final and Snell wins and John only get 3rd place ? one was best coached by Lydiard than the other ? Arern´t they from the same period and train with the same coach ? Why so ? What makes Snell best than john ? Best training method ? Why Bob Schul was able to win the 5000m in 1964 olympics if on that one fiinal did particiPATE a Lydiard runner ? Why he lost that one if Lydiard method makes winners ? isn´t the Lydiard training as good for David as for Snell ? Strange thing that 2 Lydiard runners one is best than the other ? No talent there, Bannister did more talent than Snell. Snell have no major talent really. Thats all about the Lydiard training.