History of our Census
Getting an idea of our population has always involved a significant amount of interpreting messages from our subconscious. Today, we use a combination of direct communication with subconscious members and neurological structures with external world observations and calculations to maintain a fairly accurate estimate.
With a population number as high as ours, and the mechanisms by which we know it grows, one does feel compelled to ask, "What exactly is a headmate?" and "Where should we draw the line for who is counted as one and who is not?"
Aside from the ethical pitfalls of drawing such a line in a population of individuals who are constantly growing and developing, we just don't have the practical means to draw such a line and get a restricted propulation count.
For this reason, we count each distinct self-schema as a full fledged system member, regardless of current complexity or apparent autonomy.
To date, the only entity in our system that we have solidly confirmed as a "part" is the Auditor, which may not have a self-schema.