I have a theory that Groove Of Midnight is the last Rod Temperton written song Mike recorded.
If you listen to the snippet we have, when Michael and Rod talk, Rod says Mike's hair has grown since he last saw him. Rod also says he last saw MJ in October, so you'd assume this recording takes place in early 1987. Given Rod's surprise at how quick it's grown
I'd assume Mike recorded the song, because in the snippet it sounds like he is recording the chorus backing vocals, when you compare it to Siedah's released version. I doubt he record the backing vocals and not the lead vocals. But that's a guess on my part
I love MJ's raw vocals in the snippet we have but I wouldn't say the song is a strong demo to be honest, Siedah's version is a little bit filler