Ok, when all is said and done, here is my opinion. MJ did record a bunch of guide vocals in 2005 with Eddie and James. He did work with them on the songs to some extent. He told them he’d lay down proper vocals for the 3 or 4 songs he liked the most or had done the most extensive work on. Porte sent those songs to Montrone, with his own vocals on it, imitating MJ – apparently he’s pretty good, if we believe Montrone and/or Korgnex (the latter seems to be 100 % certain – based on facts he has but probably shouldn’t have – that it is Porte singing the “too bad” line, which indicates Porte’s a pretty good MJ impersonator, or a pretty good JM impersonator, both skills that we didn’t suspect he had).
MJ dies, and Cascio/Porte take the few MJ vocals they have from 2005, and using a lot of studio trickery plus a ton of added vocals from Porte, doing his best MJ impersonation, they produce 12 presentable songs.
When the controversy breaks, it’s decided for legal/PR reasons to stick to the official explanation given, if only because the true story of how incomplete the original MJ vocals were, and how much Porte vs. MJ there is on some songs, would lead to bad publicity/legal grumblings about the ethics of selling as a MJ product songs that really only have, say, 40 % MJ.
And there we go. No big conspiracy, only a bit of fudging of the truth regarding MJ’s true contribution to the Cascio songs. The official story is true, or at least “true-ish”.
And I’ll make a concession to those that thought it was Malachi : MJ’s vocals, blended with Porte’s, taking into account that we didn’t know Porte’s voice, but were familiar with Malachi’s, could lead one to think it was actually Malachi, when it was another impersonator after all.