Bruce Irvin becoming a sack machine for Raiders

OAKLAND, Calif. -- Bruce Irvin might have been the most upset member of the Oakland Raiders defense when Ken Norton Jr. was fired as defensive coordinator.

Irvin was certainly the most, ahem, vocal, as evidenced by a tweet that expressed his displeasure at the time.

And yet ...

Irvin, who signed as a free agent with the Raiders in part due to Norton’s presence after they were together with the Seattle Seahawks, has been playing his best football since Norton’s departure, with assistant coach/defense John Pagano taking over as defensive playcaller.

With multiple sacks in two of his last three games -- the first time he has pulled that off since his rookie season of 2012, when he had three such…