The Spurs kept giving him to work with. Like what's he supposed to do with a post-up that starts 16 feet from the basket? Asking him to dribble against a double is just irresponsible. In Game Six against Houston, they kept giving him the ball in the right places, and he dominated.
Yes, his personality had a fair bit to do with why he was forced out to 16 feet, and he often attacked in the wrong direction, shooting a fadeway instead of making an inside move. That's on him. It's also on Pop that they didn't get that worked out. Not all post-up players are created equal, and passive LMA gave a bad name or aggressive LMA.