Sensui was a very powerful human, noted himself to having more than ten times the spiritual energy than Yusuke in their fight. When Sensui started releasing his Sacred Energy, Hiei mentions that if Sensui was a demon, his energy levels would have been S-class, even though he was still suppressing his true power and openly saying that he was using less than half. At full power, he is within the lower S-Class range, that can easily kill a army of 500 upper A-Class, since it is heavily implied that a Demon or Human becomes 10 to 20 times more powerful when they ascend from A-Class to S-Class.
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