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It’s blockbuster contract season. Alvin Kamara’s remote “Call of Duty” game was interrupted on Monday by $64 million worth of breaking news. “Ooh, wait. Pause, pause, pause,” Kamara shouted to the other three players in the game. “Carolina’s Christian McCaffrey has signed a four-year extension, $16 million a year.” The deal makes the 23-year-old McCaffrey...