Darth Maul is dead. No amount of rage could save him from his fate. Not only was he cut in half, but he also fell to the planet's core from which Naboo draws is power. He is ash, nothing more nothing less. And yes, while he may look intimidating, though he may look like the most powerful Sith you have ever laid eyes on, he is not. Powerful yes, skillful yes, well trained with the light saber yes, but all powerful? No. I think the novels and comics made his fate pretty clear. Dead is dead, and no the Visionaries story arc do not count, they are not canon!
Likewise, Mandalore is an autonomous collective, it's not some "cultured" politically correct collective for douche bags. No Mandalore's government toppled, like two times and it has been the law of The West ever since then. The general rule is this on Mandalore,"you don't cross me, I don't shoot you." Why do you think Mandalorians are so feared? Because of their ability to talk hours on end about political philosophy? Real Mandalorians only have time for action, not philosophy, comfort, and a nice fitting wardrobe!
And in the case of the invented Darth Maul's Brother character in Clone Wars....
ummmm, you can't be granted Sith Skill over night via magic, that's just retarded! Why would Maul even care about his brother after all these years anyhow? If a Jedi can sever his connection with his family and loved ones, don't you think a Sith does too only a thousand times over? They generally crave power, not brotherhood. The idea of Maul having a brother, or at least one he is capable of bonding with after years under Palpatine's control... is just plain stupid.
Anyhow, that's my rant for today.