Richard Sherman knows what it takes to be a good cornerback in the NFL. He is likely a future Pro Football Hall of Famer, and he still observes the sport with a keen eye. He also clearly is a fan of the Seattle Seahawks, and comments on them freely.
Maybe Sherman's connection to the team is obvious. He played for the Seahawks and won a Super Bowl. He also still lives in the Seattle area.
But he is also fair in his assessments. Some find his way of conveying his thoughts a bit too loud, but that is what gets a person heard in the white noise of sports commentators.