Kawhi would benefit the Nuggets greatly. With their weak point being at the wing this year, he would solve these problems instantly.
Second, it would benefit to look at some historical information regarding the Spurs; Popovich has been a genius at grooming and utilizing front court players. From The Admiral to Timmy D to the resurgence of LaMarcus Aldridge, the Spurs have never lacked for a devastating presence at the 4 or 5. Their style allows talented bigs to run a low-risk, inside/outside post game that utilizes bigs with touch masterfully. Nikola Jokic is tailor-made for the Spurs system and I believe Pop could push his game into the stratosphere.