User blog comment:Keekian/The 20 "D" families/@comment-53539-20161227104140

My crib is this; not all equal powers do so in equal numbers.

Look at the current situation;
 * 1) The marines are many, broken into ranks, the higher the rank the stronger in theory they are.
 * 2) The Shichibukai are 7.
 * 3) The Emperors are 4 and have strong alliances with various crews making them harder to down.

Each one keeps the others in balance, but how they are strong is different. And their strength varies within their groups. This is likely how it was 800 years ago. The D. are basically a old tribe that has been broken and scattered. We don't know anything else beyond tadbits, how can one draw any conclusion on that?