Why Aaron is with Thomas
I thought the story that Ben told to Jack about Thomas the Apostle was a little strange, and then I got to thinking. What if Ben had contacted Thomas (Claire’s boyfriend, Aaron’s real father) about Aaron being off the island? It would make sense that Ben’s lawyer could threaten Kate with a change in custody if she did not cooperate with them if they had been in contact with Aaron’s real father (although the change in custody works with Claire’s mother as well, we later found out she has no idea of Aaron’s existence).
Maybe Thomas gets reunited with Aaron and although “having doubt” at the time of the pregnancy, changes his mind once he sees the child “in the flesh” (much like the Apostle Thomas). If Kate was present during this reunion it could have been enough to put her over the edge, stop living the lie and realize that there is nothing left for her off the island, inevitably leading her back.
I just can’t seem to buy into Aaron being with Sun’s nanny or Claire’s mother (who doesn’t even know who Aaron is).