While the Broker is a colossal turboMarySue and I don't recall, or want to recall, the details of his many clone setup, there were some other things in the novels that were relevant.
Such as the whole plot with Falek Grange's clone being activated in the CRU, and becoming that guy who had amnesia, (and who was also cured of being evil, because he didn't remember any of his Theology Council education, which is ofc what turns people evil in the EVE universe).
the human mind is already bad at multitasking, I don't see it being possible, even with technosorcery, of controlling 2 or more bodies at once. If the Broker did that in the novels, I don't remember reading it.