In the ultimate irony, the vaporfly designs, with their ridiculous stack heights and mushy foam, caused the previous bulletproof Rupp to develop a career ruining Achilles injury.
I noted, watching both Kipchoge and Berkeley in these monstrosities, that it causes the heel to torque inward and the toes to point outward upon toe off.
A runner with beautiful form like Rupp who needs just a neutral shoe and was always healthy was crippled by these unstable gimmicks.
A tragedy for Rupp, and a joke on our sport.