In my opinion, a bard would be a great addition to the CMM (criminal mastermind), but is a bit too much in the front row, if you ask me. As already mentioned, a bard is pretty obvious when operating and manipulating, so the CMM should use one, but rather not be the one in the spotlight.
I agree with the earlier posts, it makes sense to build a mystic or a seer. Perhaps you could present the CMM to be a messiah or a prophet, thus claiming to be a humble follower of the gawds. That would be another position in the first or second row, but it could be worth the risk.
Think of the movie Kingdom of Heaven. No need to argue if this movie is rubbish or not, but there is a scene when a bunch of templars get ready to attack a trader caravan and the leader shouts something like "god wills it!" or "god wants it!", claiming that this raid is justified with gawd's benevolence. And his followers repeat his warcry and attack.
Or perhaps your CMM can be the "consultant" of the aforementioned prophet, "guiding" him in his decisions and stepping back into the safety of darkness and obscurity should some other parties come to the prophet to present The Bill, demanding attonement and amends.