I think BCC is being misconstrued here as representing a scale. A value of 0 means all signals negative. A value of 7 means all signals positive. But in between there is no scale. The values 1,2, and 4 each mean that one of the indicators is positive and two are negative. The values 3,5, and 6 each mean that two of the indicators are positive and one is negative. So values of 1,2, and 4 are effectively equal, unless you decide to rank the three indicators relative to one another. The same goes for values of 3,5, and 6.