If the Knicks do land Durant and Irving, I'm not so sure they would trade for Davis if they had Zion. I think they might just keep Zion as the 3rd option, while also keeping Smith, Knox, Robinson, and Ntkilina. That team has a much clearer hierarchy and roles than if they were to add Davis to Durant and Irving. I mean is Davis really going to be happy as the 3rd option (and he almost assuredly would be as Irving will have the ball and Durant is just better). You keep Zion, then he is a very happy 3rd option and they still have all of their young player depth. That team makes a lot more sense in many respects. Now if they only land Durant, then absolutely trade Zion for Davis and get that 2nd star to pair with Durant that way.