I think it may have something to do with how he's all special and whatnot with the forerunners. That is implying that he is better than the others Spartans, which he isn't necessarily better.
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He just has a bad case of main character syndrome, where they can do anything they want with him and everyone would accept it. He could be the love child of a forunner who came back in time because he sent them back to inseminate to make sure he was born and everyone would love it