If it's all about the shoes, then -
Why did Izzo and Gregory not get within 100m of Kim Smith's 2004 facility record?
Why did Terry not get within .50 of Knight's 2008 200m record?
Why did Boling not get within .40 of Spearmon's 2005 record?
Why did Iowa State and Ole Miss not get within 3-4 seconds of Oregon's 2020 record?
Why did Charlie Hunter not come close to Bernard Lagat's 2005 Mile record?
Why did Gregory and Izzo not come within 4-sec of Hull's facility record from 2019?
Why did Franklin not come within a second of Arroyo's 2017 record?
Why did Hurta not break Frey's record?
Oh, right. Maybe talent/genetics and training play a part outside of shoes... thanks for playing.