The KC offense isn't going to be able to just shove it down people's throats. They don't have the line, and don't have a QB that can chuck it downfield.
Cassell actually got worse in the 2nd half of the season, as Charles was the 2nd best fantasy back. They cannot rely on Cassell to win games, so I think their plan is to get the ball in the hands of players that can take short, safe plays, and score. That is Charles, McCluster, and Bowe.
Jones gets the short yardage stuff, the goalline stuff, the tough yards. But I think Charles is gonna be the main offensive weapon. Not sure that makes him worth his current ADP, but I still think he's much more valuable to owners than Jones is.