Justin,
"In many cases, its not all that helpful or necessary to be that aware of the many other lifetimes or selves within ones Disk, though it is interesting at times to wonder just how many expressions of this larger, greater self there are."
I agree. And also think it can be good for trying to understand the totality of your self.
"Perhaps you are coming close to what Monroe called "completion", wherein a Disk and most of its selves/extensions have consciously reintegrated into an awareness of the larger Whole of the Disk and also becoming aware of its Oneness with All other Disks and energies?"
Recently I found some good videos with Robert Monroe on Youtube, seven parts, and I really enjoyed part 5 to 7, and especially part 7.
In the last part he said, at the end of the video, that he really wanted to meet the maker(s), in a non-bowing and scraping fashion, and that one of many possibilites YOU could do upon graduation, was to become a maker yourself. - My view is that there are different makers for different galaxies, beings that have graduated 3rd density games.
Part 7 of the Monroe interview:
http://www.youtube.com/watch?v=QI91ETw-jio