Regarding using alternate vocal takes - some of MJ's multis can be confusing. I was working with Blood on the Dance Floor over the weekend and his main lead vocal appears to be shared across some tracks.
Also, the "It was blood on the dance floor!" vocals are hidden on a track that contains and is named "handclaps" or something similar (which made me realise that in 1997 it was overlooked for all the BOTDF remixes that were released because none of them have this part of the vocal in the song).
So it could just come down to the person doing the Dolby mixes just not being familiar with the song, maybe?