The thing not many people, if any, are considering is that while GSW was busy adding a top 3 player, The Cavs were busy losing Dellavadova, their backup PG, and Mozgov, their backup center, and replacing Delly specifically with Deandre Liggins and Kay Felder.
If they had Delly they wouldn't need another "playmaker", and even if they lost him, if they had Mozgov, they could've traded Mozgov for someone.
The Cavs are not the same exact team from last year. Lebron wouldn't be complaining if they were. He's realizing the Cavs are worse now and that isn't enough to beat an improved GSW team.