Richard Sherman knows what it takes to win a Super Bowl. He won one with the Seattle Seahawks at the end of the 2013 season. He also got back to another after the 2014 season, though he was playing with basically one arm in the Super Bowl after getting injured in the NFC Championship game.
He has also always been one of the smartest players, even though sometimes many don't like what he has to say and how he says it. He can be boisterous. To be fair, that is seemingly how one gets their voice heard in media currently, so Sherman is only playing the game the way it has to be played.