You would do well to read the model as described on Tom's Wiki: http://www.wiki.my-big-toe.com/index.ph ... _Link_Page
What you are asking is described there.
First there was the LCS with no consciousness but there was some kind of a basis for interactions of reality cells containing or not containing a 'bit' of information. Then there was a change which was/is natural to such vast systems that interact in the way that the reality cells of the LCS do. This change spread naturally throughout the whole of the LCS with the result that all of the LCS was made into one thing where communication could occur over any part to any other part as opposed to simply local communication. As part of this change, there was a natural creation of 'parts' as the whole of the LCS was broken down into smaller parts which began to communicate together. These parts were known with no name and had no identities or function as such but eventually everything developed by means of this communication between these parts. In this model write up, these are referred to as proto-IUOCs as they eventually became the IUOCs that Tom describes. At the beginning being described here, this was what Tom referred to as AUO because the whole of the LCS was all one thing: these naturally occurring parts communicating freely amongst each other and developing into The One Consciousness.
It isn't that then AUO 'broke' itself into pieces in the sense of taking something which was in one undifferentiated piece like a board of wood and breaking it into two or more pieces. But it was all one thing as AUO and was deliberately broken into pieces as the proto IUOCs in the sense that to begin with those proto IUOCs had no identity but were just part of what allowed AUO to be all one thing (allowed communication over all of the LCS) as AUO/The One Consciousness. There was first the Union of all proto-IUOCs before ever there were IUOCs being provided with individual identities and experience of consciousness by the creation of VRs. Do you see the distinctions being made here?