OAKLAND, Calif. — Profanity-laced chants about Antonio Brown reverberated across the concrete walls, each round growing louder and louder as the Broncos watched their renewed hope fade into the sea of black.



The home of the NFL’s offseason circus transformed into a place of celebration Monday night, as the Raiders trounced their division rivals and sent them packing with a similar frustration they felt only nine months ago when Denver lost at Oakland on Christmas Eve.



“Disappointed, but not discouraged,” was the way coach Vic Fangio and many of his players described the Broncos’ strange and eerily familiar loss to the Raiders.



Emphasis on the disappointed.



“I think once we see some of the mistakes we made or the plays we didn’t make that we’ll see that we can be better than we played tonight,” Fangio said.



What was supposed to be a grand debut of a new defense and remade offense was a...