That's just Cooper. At his press conference yesterday Cooper was asked a long question about his serious demeanor. Answered it with one word: "Exactly." Also, according to Ian Rapoport, he wanted to go to the Raiders:
Ian RapoportVerified account
‏@RapSheet That’s funny...
George Atkinson @Georgeatk3 · 1h 1 hour ago
Feeling Blessed! Just got activated! #GodIsGood #RaiderNation
pretty sure denarius moore getting cut now. ga3 is a returner
Josh Dubow ‏@JoshDubowAP 55m
Hayden wasn't only #Raiders defender with bad day. Per @pff Brandian Ross allowed 10 of 11 throws to be completed for 151 yards, 4 TDs