After looking at all the evidence for survival it looks like to me that reincarnation and survival after death in another reality both exists. I base this on the strong evidence for both views, and that the soul does need to learn physical pain, sorrow etc. This is a tough school we are all in until we die, it's really up to us if we choose to come back to this reality or not. The evidence from mediumship for example is very mixed on this issue of reincarnation, perhaps we reincarnate, perhaps not. This does appear to fit in what i said above that we choose to come back or not. The implication of course for the view that reincarnation is real are very big indeed.
Michael Tymn talks about the group-soul idea, including "Myers' " discussion of it in Cummins' in a earlier book The Road to Immortality. Referring to the mediumship of Maurice Barbanell, Tymn quotes the spirit entity Silver Birch as saying, "... there are what you call ‘group souls,' a single unity with facets which have spiritual relationships that incarnate at different times, at different places, for the purpose of equipping the larger soul for its work."
Tymn goes on to say :
Silver Birch also likened the soul to an iceberg in which one small portion is manifesting and the greater portion not manifesting. He apparently was referring to what others have called the "Higher Self," the "Greater Self," or the "Oversoul" ...
However, he stressed that the individuality of the "facets" within the Group Soul is maintained.
I like to finish this post with a quote from a scientist in the journal of nervous and mental diseases
Dr Harold Lief wrote of Ian Stevenson: "Either he is making a colossal mistake, or he will be known as the Galileo of the twentieth century."