Not really sure what you mean Yogi. Nothing Dennis has released is called "The Grand Illusion" and he never has released a live album with an orchestra or his solo music - so I do not consider it a rehashing. If Styx did something similar (with the orchestra and played classics), I wouldn't call that a rehash either. Of course, I'd still not likely buy it.
Bands leave some songs unreleased for various reasons. Sometimes the guys in the band don't like how the song came out on tape therefore they want it to be unreleased. Kinda like that photo of you when you were 5 years old... it may be cute to you and your family - but it's not something you want thousands of people looking at because you're not at your best. Artists have every right to maintain control over their creations. If they wish to share them, then they will - if not, then that should be respected. Nobody has a "right" to a recording from any band ... just because something exists, doesn't mean just anyone can release it nor does it mean you have the right to hear it.
If Dennis doesn't want songs out he doesn't feel are a reflection of the kind of artistry he wants to put out, then that is his right. Tommy and JY can released all the rejected songs from Cyclorama they want - but they should leave the decision on Dennis unreleased work up to Dennis.
Not sure if it ever appeared on MTV (the video).... It was... interesting though