The U.S. pulled off the Presidents Cup comeback, and now the question isn't whether they won, it's what they proved about themselves heading into September's Ryder Cup in Ireland.

The turnaround hinged on which Americans showed up when the pressure mounted. The team needed role players to step outside their usual spots and deliver. Some did. Others didn't. That's the real conversation for the U.S. heading forward.

The Presidents Cup victory matters because it's a referendum on American golf depth. The Ryder Cup is different. Ireland will be hostile. The European team will be sharper. And the U.S. can't afford to rely on the same guys carrying the load every single session like they did here.

If you watched all three days, you saw what works for the U.S. when it works. Experience plus youth. Star power plus hunger. But consistency disappeared in stretches. The comeback papered over some genuine cracks in team composition and pairings.

For the Ryder Cup, the captain's job becomes tighter. Europe doesn't make the mistakes that allowed the U.S. to storm back. They don't get comfortable. They finish. So this Presidents Cup win should feel good for a week. After that, the real work starts.