When the Spurs said goodbye to Marco, CoJo and Tiago and added Aldridge and West, they didn't just give up a lot of corporate knowledge, they fundamentally changed type of players they'd had -- adding certain skills and losing others. As we know, Pop caters his system to what his players do well, which means making changes to they way the Spurs play. Here's an explanation of those changes.
I don't write as much as I used to, and even then I don't write as well (or understand basketball as well) as so many of the great basketball analysts covering the NBA from every angle.