Secret Ansem Report 5

In this realm, where all existence has been disintegrated, I have just barely managed to preserve my sense of self by continuing to think and to write.

It is a place where even time has lost all meaning. Eternity is as but a moment here.

I must make haste. Certainly their plans are already underway.

The Heartless must be the key to unraveling this mystery.

The six traitors were operating a laboratory that churned out those cursed shadows.

Not only did they generate "pureblood" Heartless from living hearts, but they then used those Heartless to synthesize artificial versions of the creatures as well.

These synthetic Heartless bore insignias and were called "Emblems."

Pureblood or Emblem, these Heartless act only to fulfill their instinctive needs.
They single-mindedly detect hearts and swarm around them.

A human's commands would be ineffective: the Heartless would easily steal the human's heart and use it to increase their own ranks.

But what if an even stronger Heartless was giving the orders?

If he cast aside his own soul and body and became a Heartless, wouldn't he be able to control the otherwise intractable Heartless?

Furthermore, wouldn't he be planning to make use of the creatures' instincts?
If the heart-seeking Heartless have their sights set on a larger, more powerful heart, their ultimate goal is crystal-clear.

The largest heart in existence—the heart of the world.

This is all conjecture, but it would seem he is utilizing the Heartless in his search for a path leading to the heart of the world.