Lorde should have been the one assigned to tribute David. He has never spoken fondly of Gaga publicly but he's been quoted saying Lorde's music is "the music of tomorrow". If there isn't a relationship between him and Gaga (or worse, a negative one) it makes no sense for her to be the one to do it, that's not what he would have wanted. Lorde could pull off an androgynous performance easily, especially if she performed "Velvet Goldmine".  Furthermore, if Gaga uses the tribute to David B