For what it's worth, my 2 Cents on the subject of moving forward in incarnations.
For whatever reason, I strongly believe that we move forward, not backwards, we advance in our incarnations as we hopefully gather knowledge on our journey forward, amassing lives as we move through time, as we know it on this plane.
Now I can see someone, in Spirit or in a Body, studying the past to learn from their mistakes, but to have a full incarnation in an earlier time by going backwards, I just don't agree with the concept.
However those who have differing opinions on this, have a right to their opinion and beliefs, just as I do, and we can both agree to disagree, in a highly civilized manner.
I suspect, when all is said and done, that the correct answer to the question, may in fact, lie somewhere between your opinion and my opinion, and we were both wrong, yet we were both right.