Playing over the weekend, Gale FINALLY told me about the magical "condition" he has. However, during the cut scene where the mind-sharing is going on, gale and the main character are standing in the same space on the ground, clipping each other out. Not sure if anyone else has run into this.

Of note, Gale has NOT told me that he needs to consume magic items yet. Not sure if that's because I had Wyll in the party at first because he seems to be moderately more surviveable than Gale.