Here is how the lost souls, now ready through collective memory, are ready to "move on" after death:
FRONT ROW (left to right)
LOCKE (aisle) JACK KATE
SAYID SHANNON BERNARD ROSE (aisle) CHARLIE (with Aaron) CLAIRE SUN JIN
BOONE JULIET SAWYER (Christian in aisle) DESMOND PENNY HURLEY LIBBY
BEN remained outside because he was "not ready."
There were 20 "main" characters in the end scene, which means that only these characters had "found" their lost souls through redemption, realization, solution to their past lives' issues, enlightenment (or even just "letting go of the past,") in order to "awaken" spiritually to move onto eternity. Aaron with Charlie and Claire is the one odd element, for to be in the sideways world he would be dead. But at some point he "existed" in the real world prior to 815, while David did not. It does support the observation that only the pre-815 events were "real" and the island and sideway worlds were split views of the after life (how free will and different choices can change a person's humanity or spirit.) Total enlightenment comes with the realization of the black and white alternatives.
