Warriors bench steps up vs OKC after late lineup experiment

SAN FRANCISCO — Steve Kerr, for reasons he wishes didn’t occur, was forced to make a totally unexpected change to his starting lineup Tuesday night against the Oklahoma City Thunder in what essentially was a must-win game to help avoid the play-in tournament. Klay Thompson was a surprise late scratch when his lower back flared up right before walkthrough, forcing Kerr to scramble. In the 80th game of the regular season, he turned to a group that hadn’t started a single game together, going with Steph Curry, Jordan Poole, Anthony Lamb, Jonathan Kuminga and Draymond Green. The experiment failed from…