Gregg Popovich, Spurs players, and Spurs fans spent years anticipating the passing of the torch from the Big 3 to budding star Kawhi Leonard. When the long-awaited day finally came, it wasn’t the way anyone expected. It’s didn’t happen on June 15, 2014, when Kawhi was crowned the third-youngest Finals MVP in league history. It wasn’t April 8, 2015, after …