Charles says to Ben that "Everything you have you've stolen from me".
We also learn that Ben somehow banned Charles from the Island.
It is implied (as I remember) that it may have been connected to when Charles sent Ben to kill Rousseau and Ben returned with Alex and they had an argument whether it was Charles or Jacob who wanted to kill the kid.
What exactly is the reason Charles got banned and was it him or the Island who wanted to kill the girl?
It is possibly 2 questions, but I think they are very closely related so possible it'll take just one answer.