Just to answer you in an objective way:
Yes, ISIS is a Sunni group. Ibrahim was chosen by his followers as he says. He also claims he is one of the grandsons of prophet Muhammad. Almost most of the Muslims leaders claim that, but they ignore the fact that one of the uncles of Prophet Muhammad was one of his most violent enemies. That means it means nothing to be from the same family of prophet Muhammad. I hope I make it easier for you
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I won't repeat myself with you again.
My knowledge of Sochi's history is much higher than all what you know about the whole Middle East, so try to play another game...