It’s going to be a long offseason for the Lakers. After an up-and-down season, L.A. found its groove in late February and reeled off 16 wins in 18 games to move itself near the top of the Western Conference. It appeared that Luka Dončić, LeBron James, Austin Reaves and Co. had finally figured out how to play together. The Lakers became a dark-horse NBA title contender, and it was fully believable. Then it came crashing down. Twin injuries to Dončić and Reaves suffered in an April 2 game against the Thunder sent the team reeling. James and the rest of the squad showed tremendous grit by beating the Rockets in six games during the opening round. Reaves returned from an oblique injury but struggled to find his rhythm, and with Dončić sidelined by a hamstring injury, the Lakers never had a chance against the Thunder in the Western Conference semifinals. They put up a valiant effort in Game 4, but were swept by the defending champs.…