If you just subtract KD from the lineup?
You are correct.
But they would have signed other pieces in KD's place that might have fit the Warrior system better and still made them the team to beat.
A lot of variables out there and no way to know what the extra pieces would have been and how well they would have done.
Bingo. KD is good enough they have found a way to make it work. But they aren't as dominant as if they had a 2nd tier player who actually fits the GS system.