I guess it is astounding to me that as good as Galen Rupp is, he'd have his hands full trying to defeat Lagat at 5000m. Lagat is as good as any U.S. runner currently at 5000m and he is turning 40 in just over 3 months.
How is this even possible? Who would be certain to beat Lagat among U.S. runners? The answer is nobody.