Aaron is Jacob. That is why he is so important. Why his family is so important. This is why Christian (his grandfather) speaks for him. Why Claire has no problem leaving him in the jungle, because she knows his purpose. Why who he is raised by is so important. He is also the only one born on the island when no others can be.
Charlie (Penny & Desmond's son) is MIB. Maybe Penny and Desmond die or somehow the boy gets taken from them by Widmore. And he is raised by Widmore. Bringing him up without the goodness of his parents. Causing him to end up evil like his grandfather. His family is also important. Charles Widmore, Eloise Hawking and Daniel Faraday.
Maybe these two start their lives during this time and time travel back to the other times where we see Jacob and MIB.
Charlie (Penny & Desmond's son) is MIB. Maybe Penny and Desmond die or somehow the boy gets taken from them by Widmore. And he is raised by Widmore. Bringing him up without the goodness of his parents. Causing him to end up evil like his grandfather. His family is also important. Charles Widmore, Eloise Hawking and Daniel Faraday.
Maybe these two start their lives during this time and time travel back to the other times where we see Jacob and MIB.