Hmmm, I don't think it'd be redundant. It's common knowledge that the cost is too great when it comes to recruiting Minthara. (losing Halsin, Karlach, and Wyll) so it would be nice to have another companion who could accompany you. It's a plus that he is evil aligned, however the very fact that you are also able to convince him to abandon the Absolute gives him so much potential as a character imo.
