Klay by nature is a Robin, but you have to put him in the first tier because the Warriors are going to be so much worse without him, not only because of his clutch shooting and defense, but his locker room presence.
Kyrie and Butler are definitely not Tier 1 players: they are too limited in their games and they have proven to be locker room cancers.
As far as the coaches, I know Philadelphia had a poorly constructed roster. But Brett Brown still hasn’t figured out how to get Simmons and Embiid to play effective minutes when they’re on the floor together in the playoffs. They’re very lucky they didn’t play Boston again. Philly played in the East and only won one less game than last year. Simmons didn’t improve one bit, and slipped a lot on defense. He couldn’t figure out how to rest Embiid 10 minutes per game. The only reason he played Simmons at center was an accident, when Embiid sat out. It was gross negligence not to have worked on those lineups this year. The only lineup used this year that didn’t feature a second big was Redick, Harris, Butler, Scott and Simmons. They only played 39 minutes.