#8: Kevin Knox
You can say almost all of the same things about Kevin Knox that you said about Livers, but add that he's not even able to crack the rotation of the worst team in the NBA.
There is a reason he was available for the Pistons to sign as a free agent. The Pistons wouldn't even get a single second-round pick for Livers or Knox, so what is the point in trading them?
#7: Marvin Bagley III
I think the Pistons would trade MBIII today if they could find a single taker willing to offer an expiring deal.
Bagley III could be a nice third center on a good team, a guy who can come in and get you buckets in a hurry but has severe limitations defensively.
Unfortunately, he's not getting paid like a third center and has another year on his deal beyond this one, which is going to make him hard to move.
This is why you don't outbid yourself for players that no one else is pursuing, which was the case with MBIII.
If the Pistons can get literally any expiring deal for him, they should.