Agreed. I've seen some references in the Instaverse to the possibility that Kosgei's performance raises an eyebrow, given that Federico Rosa is her agent. (And let's face it, everyone's doubting every big effort right now.) But I do think many of us have been training in exceptionally tough weather conditions this season and Chicago's weather was nice and cool. I have several fast friends who had amazing PRs, like one who went from a 3:29 to a 3:18