Just defeating Jaguar Man alone would be sufficient evidence since she stonewalls the party and Merlin until you can get Ishtar on your side. That also makes any contribution the team could make against the Llamu minimal.
I didn't say he kept power, just skill and he regularly fights as an assassin anyway if his gameplay maneuvers are of any indication.Re: King Hassan he only says that his "Assassination skill" are still there, not the he retains all the skills/power he got as a Grand Servant