Ahh, so just to clarify in my mind:
If I use creature id 778877 & 778878 in battle, and you use creature 778870 & 778874 we would have a "score" of 11 right?
(obviously, there would be 6 creatures on each side, but you are comparing the id per slot, yes?)
..77-..70 = 7 and ..78 - ..74 = 4 (7+ 4 = 11) maths are hard
So ideally, you'd want to use low id creatures against high ID ones, for the largest 'spread'?