SAN FRANCISCO – Coming off three consecutive losses, the Warriors went back to school on Sunday. They spent two hours watching video displaying highlights and lowlights. They studied. They scrimmaged. These are things that any NBA team sensing slippage yet still aspiring for a championship ought to do when it’s sitting on a 9-9 record nearly a quarter into the season.But the Warriors, in addition to the Jonathan Kuminga being on the sideline, also are nursing new wounds. Draymond Green has a foot sprain and could miss the game against Utah on Monday, and Al Horford is coping with sciatica and will miss at least a week.Asked if the Warriors might assemble their eighth starting lineup of the season Monday, coach Steve Kerr left open the possibility.“Well, just depends on Draymond’s availability,” he said. One week removed from a three-game win streak and hoping to build momentum, the Warriors since have lost the final two games of a six-game road trip, at Orlando and Miami, before coming home Friday seeking recovery, only to get smacked by the sub-.500 Portland Trail Blazers for the second time this season.The Warriors, eighth in the...