First of all, soul's aren't created by bodies. Rather, souls make use of physical bodies. Therefore, if it is possible for a soul to incarnate in a physical body during a current incarnation, why couldn't it do so on other occasions?
One of the main reasons we physically incarnate is so we can learn and spiritually grow. Considering how slow people are to change, it is doubtful they can learn everything they need to learn during one incarnation. Yes, it is true that spirits can learn in the spirit realms, yet physical incarnation is a possibility. Why? Because the density level of a physical incarnation allows growth opportunities that don't exist in the spirit realm. It just doesn't make sense that a soul would be afforded such a learning experience only one time.
There are lots of sources of information which show that reincarnation is a fact. Only people who are vehemently opposed to the idea of reincarnation would be so quick to reject them.
Why are they opposed to seriously considering the possibility of reincarnation? Here are some reasons.
1. They don't want to be responsible for anything the might have done is a past life.
2. They are rigidly attached to their current personality and body image, and they don't want to have to admit that there is more to who they are.
3. They have a Christian belief system which believes it is heretical to believe in reincarnation, and because they don't want to go to the hell they believe in, they won't allow themselves to seriously consider the possibility of reincarnation.
4. They want to believe that they'll have to live through only one physical incarnation, before they get to live in heaven for the rest of etternity.
5. They aren't willing to admit that they might be wrong. After all, this could lead to a major belief system crash.
6. Their way of making a living relates to not believing in reincarnation, therefore, they can't find the openess of mind to seriously consider whether or not reincarnation exists.
Do an internet search for Ian Stevenson. He's found lots of evidence for reincarnation, and his was of doing research is very credible. If somebody responds to what I say about Ian Stevenson by saying these are cases of possession, that just goes to show you how opposed they are to seriously considering the possibility of reincarnation. I read about Ian Stevenson when I really had my doubts about reincarnation, yet his evidence is hard to dismiss.
It's odd that Beserk sites Seth as a reference source, even though he's so oppossed to Seth. Personally, it doesn't concern me what Seth has to say about reincarnation, because I don't consider Seth to be a source of personal inspiration.
Don't give up on something simply because there are inconsistencies, because you would be hard pressed to find a religious or philisophical belief system that is consistent.
Regarding Bruce Moen's disc theory, don't expect to figure this out over night. I don't believe that you can figure out what is true in this regard simply by reading what somebody else has to say about it.
It probably isn't possible to figure out what it's all about while we are here in the physical. It is possible to find out that in whatever form they exist, there are loving spirits in the spirit World who are trying to help you.
I believe the most important thing to do is to grow inwardly. To find the love that exists within you more and more. Anything else you learn is secondary by a long shot.
Here's a good article on reincarnation. Besides this article, this site has a number of good articles.
http://www.near-death.com/experiences/origen03.html