If past lives are possible then shouldn't parrallel lives be as well?

Seems to me like it would be possible of course, maybe not as common.

Also, what about those who believe we are all the same person experiencing life from many many points of view.

If I think that we are all one, existing from many points of view, then why are there particular past lives, a path really, remembered by some? Wouldn't we all have countless past lives and parrallel lives in fact if this were the case?

Even then, the idea of a past life is based on time. What about the idea of only the "now" existing. As amazing as the idea of past lives is, it seems to be strangely not so spiritual in some ways...

Somebody fill me in on this please