There is a definite clash in style between Durant and the rest of the Warriors, at least as far as end-game execution.
To some extent, I think Durant's "Just give me the ball and let me make something happen" attitude is something the Warriors needed a bit more last year in the playoffs, especially the Finals .... however, he nullifies the value of that if he proceeds to take a pull-up three with time left on the clock.
The Warriors are going to need some time to figure out how to close games with Durant in the mix. They've already figured out how to roll lesser teams over the course of three quarters so that crunch time is mostly unnecessary. The next step is working on closing things out when the score is close.
I trust them to get there eventually, but Durant is one of their main guys now and he spent the formative years of his career handling crunch time a certain way. The relatively poor results he's had in crunch time, one might hope, would persuade him to be open to changing his tactics. But he's so talented that he stands out even while playing alongside other superstars, so perhaps he won't feel compelled to change his approach.