#766, it's pretty unusual for Team USA to get their best possible group together. Even in 2012 they were without Derrick Rose, Dwyane Wade, Chris Bosh, Dwight Howard and LaMarcus Aldridge. Rose and Howard almost certainly would have made the team over Williams and Chandler if available, and if Rose had been there, they may well have taken Wade over Westbrook.
I think the 2014 Spurs would have beaten the 2014 USA World Cup side, for what it's worth.
And I think a full-strength Boomers team would beat a bunch of teams in a 7-game series. I actually think they'd stand a pretty good chance of making the play-offs in the East this year. They would benefit if Simmons were able to contribute even just a little, because I think their biggest problem would be guarding small-ball lineups and mobile PFs.