Rookie Kareem Hunt will start but otherwise one of the unknowns surrounding the Chiefs heading into Thursday night’s game against the Patriots is how they will divide the playing time at running back. The Chiefs are again at three backs after re-signing C.J. Spiller. But Spiller has never played for the Chiefs and Hunt has never played in the NFL at all. The known quantity among their backs is Charcandrick West, who led the Chiefs in rushing in 2015. Offensive coordinator Matt Nagy indicated all three backs would play. “These guys are all prepared. They’re all prepared to play. They all know they’re a big part of this game plan. That’s the exciting part. We have a team of guys that we’re not just loaded with one guy at one position. We have a group of guys that can all play well and we trust them at all positions.’’