Well I do think some things like "pronunciation" are irrelevant. I am a doubter, but to be fair here's some possible "counter arguements". Note how different MJ pronounces in performances of Billie Jean Dangerous Tour First and Second Leg (and Royal Concert). "as she cossd a scen-eh" And it definitely wasn't because he was on drugs or anything because he sounds the same way during the Royal Concert. Still, his vocal timbre can be compared to other songs at the time (do not compare to Billie Jean studio version; outdated).
Also MJ has a FAST vibrato in some songs like Keep the Faith and SOOML live. However, as much as these vibratos are fast, they are still smooth and "fady" instead of "skippy".
Also it is somewhat irrelevant to say the Cascio tracks are "ripoffs" of other songs when you can say the same thing about MJ's own songs:
Stranger in Moscow - Beautiful Girl - We've Had Enough
Dangerous tracks all have a similar beat thanks to Teddy Riley's New Jack Swing
That said, I still hold by that "ripoff" idea, indeed the Cascio tracks remind me so much of Jason's own songs:
Stay: Bigger Man
Monster: Room 2 Breathe
Keep Your Head Up: How I Do
All I Need: All That You Need Is In You
Water: I Can Make It
Breaking News: Don't Walk Away
All Right reminds me of HIStory Tour Munich in general, due to the way it's compressed in bad quality and the drums go BANG LOL
BTW I think it's strange that there are no lyrics or covers of the "extra" Cascio tracks that leaked more recently. Are they that strict? Although covering songs is sometimes deemed a violation of copyright, I believe it's more based on OPINION than the actual USE of material. I uploaded Breaking News with Vitas dancing to it. That's an album song and they flagged it just because I stated my OPINION!
A quick piano version of Water
http://www.youtube.com/watch?v=wUqXEg9rejA&feature=feedu
Enjoy while it lasts