s06e02 - LAX

My theory seems to be right about Richard Alpert. I began to think that he came to the island in the black rock. As we see on the season finale 5, Jacob and his nemesis are watching the black rock on the horizon. Nemesis didn´t want men to come
to the island, unlike Jacob. As Richard seems to be the only man on the island that
doesn´t age trough eras, I thought he was the first man to step on the island in the
arrival of the black rock, receiving though a gift. In the season 6 premiere, nemesis went out of the temple and tells Richard "It's good to see you
out of those chains.". Richard is very surprised and cries out "You?!". "Me!", says
nemesis. I´m not sure if he refers to "chains" metaphorically or.. literaly, since
the black rock is a slavery ship with lots of men in chains.

s05

On the way back to the island, Sun was the only Ocean 6 that didn´t get to 1977. Here´s my theory: Once Sun and Jin meet again, they would want to leave the island, and that wouldn´t work. So the island avoided their encounter. Also, Sun has a daughter in 2007.

As on S05e10, Ethan was born on the island and is also from the Dharma Initiative. So, how did he manage to survive to the purge, considering he was only a child?