existing IMAGINARY facts.
Beat me too it. There are [hundreds of] thousands of pages of SW lit and game resources out there-- much of it contradictory. It is completely unrealistic to expect a movie or TV production to be beholden to every little tiny detail of it.
Nor should they be. Especially if it's tiny.
And regarding the Mandalore thing. Perhaps they changed the "facts" from the EU for the Clone Wars because it would be more EFFECTIVE to use the Mandalore's to tell the story, rather than creating a new planet, a new race to satisfy the needs of the few.
I thought it was just to piss of Karen Traviss and those with a hard-on for the Mandolorians in her books?