No one knew. Russell Westbrook had a chance to put the Oklahoma City Thunder ahead in the final moments of Game 6 of their Western Conference first-round series against Portland. He tried a layup with 18 seconds left. It missed. No one knew that was the 17,350th and final shot he would take as a Thunder player, the last time he would touch the ball in an Oklahoma City uniform, the end of an storied 11-year run that — when factoring in both regular-season and postseason games — saw him score more points than anyone else in franchise history. A new day has arrived in Oklahoma City. The Thunder — one of only two teams to have a better-than-.500 record in each of the last 10 seasons, San Antonio being the other — have pushed the reset button. Westbrook is gone to rejoin James Harden in Houston, Paul George has taken his still-unfulfilled pursuit of a championship to the Los Angeles Clippers, and Oklahoma City is thinking about the future. “We’re still 100 percent focused on building the most sustainable path for an elite team in Oklahoma City, realizing that that’s something that eventually we’re going to embark on, but…