This is an article of faith that originated with Locke that has been accepted as dogma. What does an "ideal player next to a superstar" even mean? Pippen? Because he sure isn't Pippen.
Does it mean Hayward is more ideal than Leonard, DeRozan, Thompson, Ellis, Parsons, Green, Batum, a healthy Gallinari, or those types of players?
I'm not sure Hayward is better than any of those players, but that's beside the point. The point is Hayward is not the #2 wingman of a superstar, he's an interchangeable good player that a superstar can utilize to win, provided he's paid appropriately.