Hayward has closed gap on shooting, Klay still better. But Klay has defenses focused on KD, Steph, whereas GH has to create own shot more frequently. Still their efficiencies are similar. Defense is a push. Hayward much better on the boards and creating shots for others.
Despite W's notoriety, sportswriters picked GH over KT in All NBA voting.
I won't debate your 30 GMs comments since I don't talk to them, but I would say it is a dubious and unsupported statement.
There is no way Klays efficiency stays the same if he became the focal point of an offense and was double teamed as much as Hayward and had the kind of focus that Hayward gets. Klay has the most wide open shots of any player in the NBA.