The thing that is confusing: Spurs made motion famous, win a championship. Warriors adopt motion, win championship. Spurs lose to the Clippers who got physical with the Spurs and were faster than the Spurs.
So my guess is that Pop thinks that the team doesn't have the speed/talent to make motion work against the contenders in the playoffs, so he is trying to go with the offense that is most suited for his stars (Kawhi and LMA).
I get it, but we lost in a game 7 to the Clippers...so it wasn't like motion wasn't completely ineffective; home court would make the difference, and we can make that happen this year outside Warriors.
Speaking of the Warriors, just like the trouble we had with the Clippers, you gotta be physical with them. Spurs went out weak against the Warriors and didn't play motion....got waxed.