The seminar recording of “Man In Black” that leaked about two years ago is likely the most complete version of the track. Although Bryan Loren claims to have a more complete version, there’s little evidence that it actually exists- there’s no copyright registration and no one else has ever confirmed it’s existence. My best guess is (and this is pure speculation) is that the more complete version possibly has more vocals or instrumentation by Loren, but I would highly doubt that there are any more unheard MJ vocals to this song. Remember, this song was dropped early on in the Dangerous sessions, so it doesn’t make sense for a fully polished, finished version to exist.
There are conflicting accounts on “Tomboy”. The version that Damien Shields heard has no vocals, however, John Barnes has said before that this song is “95% complete” with mostly full vocals. This information coupled with the fact that “Stop That” by Zapp (which is rumored to be a more developed version of “Tomboy”) has adlibs by MJ buried in the track indicates that this might be a nearly finished outtake in a releasable state.