I would expect the future to be more like me+stockfish vs kasparov+stockfish, where the centaur part is completely superfluous. it would be a reverse centaur sort of thing where a human with legal personhood has to own the machine's output. The interesting question is whether judges or the bars manage to ban real time earpieces in lawyers that tell them exactly what to say. My case worked strictly by filings without a physical appearance, and I would have been quite disadvantage if it were otherwise.