Speed kills in the National Football League – but never forget that this sport is predicated on power. Right now, Pittsburgh, Indianapolis, Kansas City, Tampa Bay and Cincinnati are each 2-0 and have won their games by an average score of 25-9. What is it that these teams have in common besides an unblemished record? That would be their complete and total dominance along the offensive and defensive lines.On offense, these teams are completely controlling people up front. Pittsburgh, Indy and K.C. each boast lines with at least two Pro Bowlers on it. Cincinnati was one of only two teams that returned all five of its starters from last year. Tampa Bay – I honestly have no idea how they’re doing it with that line, but it’s working – possesses the NFL’s leading rusher, Cadillac Williams (276 yards). These five teams are muscling their way to an average of 155 yards per game on the ground and have yielded only eight total sacks between them. That outstanding play by the offensive linemen is allowing each of these teams to control the ball and dictate tempo to their opponents.Conversely, on the defensive side of the ball it’s all about getting after…