LOS ANGELES—Shai Gilgeous-Alexander scored 11 of his 28 points in the fourth quarter, and the Oklahoma City Thunder rallied from a 19-point deficit to beat the Los Angeles Lakers for the second time this season, 107-104 on Thursday night. Kenrich Williams scored nine of his 13 points in the final period for the Thunder, who haven’t beaten anybody in their eight games this season except the vaunted Lakers—both times while rallying from enormous deficits, and both times with LeBron James sidelined. James sat out the rematch with an abdominal strain. “We respect their talent, but with that being said, we want to prove ourselves,” said Gilgeous-Alexander, who capped his performance with a dazzling 3-pointer from the half-court logo with 1:18 to play. “They’re a team that has a lot of guys that have done a lot of good things, but we want to prove ourselves and compete.” Anthony Davis had …