I do find it odd that we don't have a companion here that's actively encouraging us to go with the Absolute. Especially since Larian has said that they gave us the evil companions first to encourage us to go the evil route. Yet none of the companions really seem keen on going the evil route.
Completely agree with this. Astarion as a companion comes the closest to this, as he likes the perks of the tadpole and therefore would rather keep it and control it, but I don't believe he speaks to the Absolute route directly. Even then, he is only one companion.
Right now it feels like they made the evil characters before or without thought towards how the evil path is set up. We really should have a more even split not just along the good/evil axis but also between companions interested in removing vs using/controlling the tadpole, considering the evil path seems to be focused on the latter.