OKLAHOMA CITY — The Lakers haven’t had a Shai Gilgeous-Alexander problem .  They’ve had a non-Shai Gilgeous-Alexander problem. Which is much worse, and one of the biggest reasons they’re trailing the Thunder, 0-2, in their best-of-seven second-round playoff series, which shifts to Los Angeles for Game 3 on Saturday and Game 4 on Monday after the Lakers’ Game 2 loss Thursday . Oklahoma City’s Chet Holmgren (7) has been pivotal in leading the Thunder to a 2-0 lead in the Western Conference semifinals against the Lakers. AP The Lakers are looking to avoid falling behind 0-3 — a deficit no team has overcome in a playoff series. And if they don’t figure out how to win the minutes when Gilgeous-Alexander, the reigning MVP who’ll likely repeat, isn’t on the floor, they’re facing quick elimination at the hands of the defending NBA champions.  “I talked about it a little bit [on Wednesday], them being plus-nine in the non-SGA minutes [in Game 1],” coach JJ Redick said.…