NEW ORLEANS -- Super Bowl XLVII features arguably the greatest inside linebacker in NFL history (Ray Lewis) and the two best in the game today (Patrick Willis, NaVorro Bowman).Average Tackle Yardage DownfieldWe've frequently heard about Lewis leading the NFL in tackles for Baltimore this postseason. That stat made me wonder whether there could be a way to evaluate the quality of those tackles. I wondered if we could generate a comparison for Lewis and his San Francisco 49ers counterparts, Willis and Bowman.