m/b/s was not the harvest of the previous octave - m/b/s COMPLEX was. the concept of m/b/s being a complex, was the discovery.
The way I understand it is based on this q/a:
78.10 Questioner: Now, I realize that we are on very difficult ground, you might say, for precise terminology here, since it is totally displaced from our system of coordinates for evaluation in our present system of language.
These early Logoi that formed in the center of the galaxy wished, I assume, to create a system of experience for the One Creator. Did they then start with no previous experience or information about how to do this? This is difficult to ask.
Ra: I am Ra. At the beginning of this creation or, as you may call it, octave there were those things known which were the harvest of the preceding octave. About the preceding creation we know as little as we do of the octave to come. However, we are aware of those pieces of gathered concept which were the tools which the Creator had in the knowing of the self.
These tools were of two kinds. Firstly, there was an awareness of the efficiency for experience of mind, body, and spirit. Secondly, there was an awareness of the most efficacious nature or, if you will, significator of mind, body, and spirit. Thirdly, there was the awareness of two aspects of mind, of body, and of spirit that the significator could use to balance all catalyst. You may call these two the matrix and the potentiator.
Complex requires the use of the other archetypes: catalyst (seemingly present before), transformation, great way.
Was it present in the blueprint of the present octave ? Maybe. if present, does this makes it 'harvest' of the previous octave ? I don't know.
=============Here there is some more about harvest of previous octave although does not say anything about complex. Complex experiment begins in this present octave, apparently.
82.11 Questioner: What was the form, condition, or experience of the first division of consciousness that occurred at the beginning of this octave at the beginning of this galactic experience?
Ra: I am Ra. We touch upon previous material. The harvest of the previous octave was the Creator of Love manifested in mind, body, and spirit. This form of the Creator experiencing Itself may perhaps be seen to be the first division.
This is somewhat out of context but can stand by itself I think:
29.26 Questioner: Can you tell me why each mind/body/spirit complex has this unique point of distortion-ridding?
Ra: I am Ra. Each mind/body/spirit complex is an unique portion of the One Creator.
It is very general, but states that it is a portion. I think it is important to distinguish this since each octave is the One Creator creating another octave. Other octaves remains present after created (and at infinity level all octaves were created already as well), and it could be that m/b/s's are portions of the Creator in the previous or a few octaves back. It does not necessarily have to come from the very first original central sun but other portions happened and the first portions were those of spirit then accumulating mind/body in other later octaves.
Of course, other portions are closer to the original creator; other entities being closer (or farther away) might not be m/b/s's. But apparently for at least a few octaves (past, present and future one) m/b/s's and complexes are the way of the creator to experience itself via these 'portions'.