Brian, I do believe you are correct in your thinking about DM being SO's real twin too. For the life of me I can't place where I read it or gleaned it, but for some reason think you are correct.
Zed, yeah just a few sentences or one describing what happened to him and how he got from Naboo to the Junk Planet would have been nice. I bet someone takes this project on as a novel or already has which is why we are not allowed to know yet. I hope.
I am reminded that there are a lot of awesome characters in the SW Verse I would like to hear more on.
There is also the brother that Savage killed when he was given power by the witches, he did kind of resemble maul. But if I were to quess I would say that they might ignore that part of EU in this.
To Maul, it's really confusing as to why anyone would first try to save him and then just dump him. Only thing my mind comes up with is Palpaltine but then why the aracnid like body. Also I got the impression that the tube he fell down was some kind of plasma power generator. I can kind of accept the rage and force keeping hi alive as he has said, but what or who got him out of there (unless it was plap who found his rage uncontrolable after such an event, but calls back to the arcnid body question).
I guess season 5 will give us something, I hope.