The bench has always been an underrated factor of Pop's equation.
Casual fans focus on the stars and starters, but historically, the bench is where the Spurs get their separation, and this year is no different. They are often responsible for cutting into deficits, or turning close games into blowouts.
Whether it's Tim and Tony or Demar and Lamar....the starters' job is just to keep up with other teams stars and keep the game close, if not gain a lead.
Then the bench mob comes in, and the game changes. Suddenly, opponents have to stop defending the mid-range, and start defending a swirling offense that covers the entire court. Even if you know it is coming, it's hard to shift gears like that...and once you do, the starters are back to punish from inside.
I don't think it is a coincidence that the first unit and the second unit play significantly different styles...and then when Pop mixes and matches them, it makes the math that much harder for opponents to figure out.