I'm going out a limb and saying for some reason the Warrior's do not win a ring this year. Maybe Durant is cursed, maybe the pieces don't fit right.
Charles Barkley was wrong one time on his point that you can't win a title primarily shooting jumpshots. The Warrior's proved him wrong, but they did face teams with their stars hurt.
The Warrior's don't have the grit, tougness, or depth to win it all even with Durant.
The Celtics were the perfect fit for KD. He would have been the undisputed #1 option and the focal point of the offense, with Thomas a perfect #2 option, Horford #3 and Bradley #4.
More importantly the C's have numerous players that do the dirty work, dive for loose balls, and play great defense.
Horford
Olynyk
Durant
Bradley
Thomas
That pushes Crowder to the bench and also he can sub for Olynyk in small ball lineups.
Bench: Crowder, Smart, Rozier, Green, Mickey
Just a perfect mix of offense and defense and a more complete team that know their roles Imo.