I would have some questions
1. How confident are you about your determination?
2. how confident are you that no other expert would say the opposite?
3. if you answered "confident" in the above two questions and if it is as objective as you say, wouldn't that be enough "proof" that would hold in court?
To answer your questions.
1. As far as my confidence is concerned, I will admit that I cannot objectively vouch for a whole song and say that it is Jason Malachi 100%.
However, there are some parts on the Cascio tracks that I am 100% confident it is Jason Malachi. (See a few pages back the falsetto compparison I asked Pentum to upload and put in a loop.)
Now, the other parts where I am less sure don't sound like Michael Jackson to me. Those parts could be Jason Malachi, or someone else. And Some copy-pasted words from genuine songs make it more difficult for me to have a clear opinion other than "something is wrong/unnatural big time". If any of the songs convinces me at its best is a part of Black Widow.
2. I would be glad to share my opinion in my field of expertise with a colleague. But, I haven't really found anyone on this board who studied applied linguistics, phonology, phonetics, comparative dialectology and linguistics of Indo-European, Indo-Iranian and Semitic languages, as well as interpreting and translating; tools which help in determining someone's accents, pronunciation, regionalism, etc.
So my confidentiality is 100% sure for the parts that I pointed out in the songs that sound exactly like Jason Malachi. Some other parts in the songs that I did not point out in my previous posts, I cannot vouch for them 100% accuratrely either because of the music overlaping or because some parts might have been pasted from previous MJ's songs.
3. It would not be enough "proof", not because of the objectivity/subjectivity issue, but because of the lack of tracability and too many parts in the songs in which it is impossible to say if it is actually Jason Malachi or someone else. So, in other words, even if those little parts are 100% confident, in other parts they managed to make the songs not sounding 100% like Jason Malachi, but neither like 100% Michael. And without any tracable proof (worktapes, videos, other demos, etc.) it is practically impossible to prove it one way or another.
As we said earlier, we can only be led to believe one way or the other. But for my part, the little bits I identified as 100% Jason, ruins the whole song for me. To me it doesn't matter if Jason participated 10% or 90% in the songs, what bothers me is that we have been led to believe that those 10% to 90% were sung by Michael alone (excluding James Porte's supporting vocals of course).