Kanye helped Nike sell flyknits too. All athletic manufacturers pretty much rely on hype whether it is generated by athletes or celebs. If you look at Js, I don't know if there was anything groundbreaking about the shoe itself when they launched. Mike's name was what sold them. This is an old playbook. At least UBs are great shoes and when the undersole turned out to be trash adidas listened and made the necessary changes. I don't mind hype as long as it accompanies substance.
Na. EU sold Flyknits for Nike.
I will agree certain colorways Kanye wore sold those but Flyknits were Nike's bread and butter by themselves.