I always envisioned Mace Windu survived his encounter with Anakin and Palpatine, just that he took a darker turn after Order 66. His lightsaber style danced on the edge of the Dark side, it wouldn't be too big a stretch. I think he turned after Order66 and I think he's out to kill the Chosen One. He saw that bringing balance to the Force meant dwindling the Jedi population down to the same numbers as the Sith. Eventually the fear that Windu had always confessed to during Council meetings consumed him. Seemed like a fun idea. Did you ever count the amount of times the phrase "I fear" leaves Windu's lips?
If lightning and getting a hand chopped off didn't kill off a green Jedi like Luke, it certainly didn't bring about the death of a Jedi Master.
I like your figure much better though. Windu gets a much happier ending.
