SAN FRANCISCO — In his first pregame news conference of the season, and his tenure as a full-time NBA head coach, David Adelman didn’t hear as many basketball questions as he probably would’ve liked.

That’s because a somber cloud hung over the league on Thursday, after the arrests and federal indictments of an active player, Miami’s Terry Rozier , and a sitting head coach, Portland’s Chauncey Billups , in a wide-ranging FBI gambling investigation.

“It’s tough,” Nuggets guard Bruce Brown said Thursday morning before the team’s season opener. “I know Chauncey’s a great guy. I’ve hung around him a little bit. It’s just unfortunate.”

The indictments — particularly Rozier’s, which involved NBA players and coaches divulging nonpublic information to associates for the purpose of placing be

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