My best friend and I, who are both huge Chiefs fans, have had a lingering dispute since the emergence of JC. He likes JC, but only sees him as a "scatback" who should carry the ball 15 times or so per game. I see JC as an every down back capable of double that load. He sees JC as analogous to Darren Sproles; I see Chris Johnson.
I would love to dump a bunch of statistics on you to make my case, but that really can't be done here. He's only started for less than half a season so it's hard to use numbers and statistic to prove his longevity. In the end, This isn't anything that can be proved right now given how fresh he is to the scene. JC is absolutely a guy you want on the field, the question is in what dosage. I was beyond impressed with everything I saw out of that man last year. He's obscenely fast, has fantastic vision,and displayed much toughness. He rarely went down on first contact and regularly layed hits of his own which is more than anyone expects out of a 195lb back. JC put up an eye gouging 5.9 YPC which was tops in the league for backs with an appreciable number of carries. He rushed for 1,120 yards in his limited starts, which if projected over 16 games, would have been 2,360 if he averaged 25 carries a game. I'll note that he typically saw more like 30 carries a game towards the end of the season. If i use 30 carries a game for the projection, his estimated yards/game reaches an impossible 2,832. At that point you start to measure his gains in miles.
JC was also second in rushes over 40 yards with 5. That is only two less than Chris Johnsons's 7, and he played the whole season.Charles puts a lot of miles on himself when he has the ball, so it's not at all a bad idea to have another back that can come in for a few plays. I just think JC is fully capable of being the primary back who can get over 25 touches. He's small, but has not been injured, which is a promising sign. He does have a problem with his shoulder, but he's had it his whole life(per him) and he might only miss a play or two when it comes up. Again, he's not played for a whole season yet, so injury could come up at some later on. I do think, however, that assuming he will be injury ridden due to his size is an oversimplification. He is really not dissimilar in size from guys like Chris Johnson, Ray rice, D'angelo Williams, and Frank Gore.
The signing of Thomas Jones say to me that the Chiefs are not totally sold that Charles is an every down back. Every RB needs a relief hitter to some in here and there, but TJ has a much too deep a resume to have been brought in solely for spot duty. A lot of you have speculated a 60-40 split between the two. I would be floored at that ratio but given TJ's credentials, its may well be the case. I am hoping for something more like 75-25. I am also hoping that this year JC can not only lead the NFL in (insert statistic), but that he can silence his doubters and prove that he is absolutely an every down franchise HB.