Jamaal Charles, RB - KC Chiefs "The impact of the loss of running back Jamaal Charles cannot be understated for the Kansas City Chiefs in 2011, as the team dropped from the best team rushing attack the previous year to the middle of the pack. Charles, who has been one of the league's biggest contributors in the past few seasons, has been effective in both the passing and rushing games. In losing him, the Chiefs was forced to adjust to a committee of backs that could not collectively match what Charles could do. Look for the Chiefs to excel should Charles return to anywhere close to his 2010 peak. Tough (if not impossible) to replace: Tamba Hali" Agree?http://bleacherreport.com/articles/1183623-the-most-irreplaceable-player-on-every-nfl-roster#/articles/1183623-the-most-irreplaceable-player-on-every-nfl-roster/page/17