Here's why I agree with Casey on the matter
Under I have listed 56 songs which we know exist, and we know have vocals. Some have more or less than others. (dates aren't precise)
I haven't even counted demos for already known songs, different versions, which may sound very different. Like Someone Put Your Hand Out demo or Speed Demon demo. Perfect examples. You could include at least 1-2 demos/different version of a song on an album for example. The possibilities are many with these projects.
And the list doesn't even include a lot of songs we know have been talked about like some Rodney, Babyface, Akon and Will.I.Am. songs. Heck, even Bryan Loren have some. And there are probably songs we do not even know about, like Dream Away sudden appearance
Alright Now (1980s)
There Must Be More To Life Than This (1983)
State Of Shock (W Freddie) (1983)
Victory (1983)
Hotstreet/Slapstick (1982)
Nite Line (1983)
Don't Matter To Me Demo (1980)
Deep in The Night (1989)
Groove Of Midnight (1985)
Throwin' Your Life Away (1985)
Ghost of Another Lover (1990)
Seven Digits (1990)
Don't Believe It (1990)
Men In Black (1990)
Serious Effect (1990)
She Got It (1990)
If You Don't Love Me (1990)
Work That Body (1990)
Happy Birthday Lisa (1991)
Faces (1994) (yes, it's a speech with instrumental, but I think it can still be released, as an interlude for example. Very powerful piece.
We Be Ballin' (1998)
Family Thing/Family Values (1993)
Elizabeth, I Love You (1997)
Seeing Voices (1999)
Days in Gloucestershire (2004)
People Of The World (1998)
Children's Holiday (1997)
Hollywood Tonight Demo (1999+2008)
I Am (Was) A Loser (2003)
Can't Get Your Weigh Off Of Me (2000)
What More Can I Give (Solo) (1998)
Hot Fun In The Summertime (1998)
Adore You (2004) (no lead vocals, but they might exist, even without, I think we should all witness it)
Be Me 4 A Day (1987 +)
Buffalo Bill (1983)
Changes (1985 + 1994) demo or mixed with both demos)
Crack Kills (1985)
Dark Lady AKA H2O (2008)
Don't Make Me Stay (some vocals) (2000s)
I'm Dreamin (2006) (some vocals)
Monster (1998)
I Have This Dream (2004 - John Barnes version)
Remember What I Told You (2008)
Rocker (2000s)
Saturday Woman (1991) (some vocals)
Tomboy (1985)
Water (2009)
What You Do To Me (1985 version)
Joy (1991)
Hollywood Tonight (1999 + 2008) (with all of the unreleased vocals)
Michael’s Affirmation with Photographs (2003)
She Don't Love Me (2008)
Innocent Man (1994 +2008) (chorus vocals)
You Were There (1989)
Make Or Break (1985)
Turning Me On (1986)
I know a lot of you will dismiss many of these titles as releasable. But I am just saying that if done correctly, and if they are willing to release them, we are looking at 5-6 albums with 8-10 tracks on each. Or projects like era focused projects (anniversary, celebrations, etc.) with demos of already released songs + unreleased songs from the sessions. They don't even need to put out albums with 8-10 tracks. They could do 4-6 with footage/videos related to the songs/sessions, or whatever. Include people who actually worked on them (which is getting too late soon because they are all passing away from age and whatnot)
And again, there are still more songs out there like I mentioned in the beginning of the post. I am probably one of the more optimistic fans when it comes to this. But do I believe The Estate will dig, research, find, contact, and do what they can in order to get these out there somehow? No, I don't