Whitney Houston was a tragic victim of her own choices. A great voice, wasted by addiction to drugs, alcohol, and domestic violence. Enough tributes were paid to her from those who knew her. Adele was not a close friend, didn't sing the same genre of music, and owed nothing to Whitney. I think it would have been disingenuous for her to say anything. Whitney chose to be a washed up drug addict, why glorify that!