"Rage is a helluva anesthetic."
- Zaeed, Mass Effect 2
I believe that summerizes how Maul apparently survived.
Anyways, at least we can rest knowing that Sam Witner is going to comment about clashes with canon. Supposedly, when he playtested the Junkyard level in TFU, he voiced disapointment when he saw a wrecked X-Wing in the wreckage (this being long before the X-Wing was introduced). He was glad to know that later on, it was replaced with a Z-95, the X-Wing's direct predecessor.