OKLAHOMA CITY — Mark Daigneault and Mitch Johnson, the two competing head coaches in the Western Conference finals, were in total alignment before the first game of the series Monday night.To them, questions about their starting lineups were overblown, with both answering like most NBA coaches do when asked about the first five on the court.“It’s overemphasized relative to what I’m thinking about,” Daigenault, the Oklahoma City Thunder’s coach, said. “It’s like, there’s no difference to me between who you start and who the first sub is or the next sub after that. … If the lights went out for the first sub and they made a big deal about that, everybody would focus more on that.”Tell it to the players.For most, the starting lineup is a badge of honor, the first celebration of the competition to follow. The cheers and the boos preview the intensity that’s to come. It’s a lot — an emotional experience.And it’s why teams, especially ones that are deep into the playoffs, don’t often put rookies in that position.The San Antonio Spurs didn’t have that choice on Monday night. De’Aaron Fox was too hurt to play, so there was only one move to consider. Dylan Harper, for the first time this postseason, was going to hear his name before the tip.He said he learned it about an hour before his team won an instant classic, a 122-115, double-overtime masterpiece. He said he prepared like it would be any other game. But it most certainly was not.This Spurs opponent destroys teams that show any sign of indecision, any moment of weakness. They run on turnovers like a racecar runs on gasoline. They hounded and harassed Harper’s teammate, Stephon Castle, forcing him into 11 turnovers.