Tyrant: He doesn't seem like the kind of character that the Prophets would like too much, especially with the ability to corrupt spirits, and his dealing with Elder gods. The family ties would probably keep him in the organization, but he'd be a kind of black sheep that they kept an eye on.
That said, the Council of Prophets are a political body and therefore at least some of them are probably not the ideal members of the Order they pretend to be.