Instead of making a juvenile joke, why dont you name a 5000/10,000 US runner who set a PR in the 10,000 on his fourth European race of the season?
You do nothing to back up any of your "objective" data, just some stupid theories on why Africans run fast. That, my friend, is called backpedalling through your own bullshit.
And how about some substantial data that back ups your idiotic "fact" that a 27:10 is equal to 13:10. Something other than "everybody knows."
I think it would be hilarious to identity a random Letsrunner, and then track his races over the course of a season. If he runs 10 seconds slower than the charts predict for a given distance, someone should start a thread and criticize him. And if you don't PR, regardless of conditions, have a very lengthy discourse on what he is doing wrong.
Seriously, have any of you critics ever run a 5000m? It's like you haven't. You don't run your absolute perfect race every single time. It's impossible. If you don't believe me, look back at your last outdoor season. Did you run faster every single race? Were you disappointed when you ran a PR?