Of all the uncharacteristic moments from Kansas City’s start to the NFL season, the final touchdown the Chiefs allowed Oct. 6 was among the most baffling. Jacksonville quarterback Trevor Lawrence stumbled and fell to the turf, twice, appearing to be an easy tackle. Instead, Lawrence got to his feet, evading Chiefs tacklers en route to a touchdown that secured a 2-3 start to Kansas City’s season. The moment appeared ominous. The Chiefs couldn’t stop a player flat on his back — and just six days