Tav is able to establish a brain bond with other party members, right? Has anyone ever noticed such a thing happening without Tav, e.g. Wyll and Gale having a brain bond?
I'm not even sure Wyll and Gale know each other exist. My theory is that Gale is a hallucination, like Charles in A Beautiful Mind.
I think they have some "banter" but otherwise don't really interact at all iirc. Gale, Shadowheart, and Astarion all seem to be fairly active with each other, and Laezel and Shadowheart are super active with each other for obvious reasons.