In a series of interviews about head injuries with The Associated Press over the last two weeks, 23 of 44 NFL players slightly more than half said they would try to conceal a possible concussion rather than pull themselves out of a game. Some acknowledged they already have. Players also said they should be better protected from their own instincts: More than twothirds of the group the AP talked to wants independent neurologists on sidelines during games.."It'll be different, but sometimes I've actually seen defenses where all of a sudden you lost your stars and you even became better, because now everybody has to be responsible and take part ownership for the leadership factor,'' Ravens defensive coordinator Dean Pees said. "Sometimes the sum of those parts is greater than the whole. There might not be the guy who was a tremendous leader like Ray or Ed, but now everybody knows they have to do a little more than what they had to do before, because we can't rely on those tw