Originally Posted by TK-8252
Grevious could not use the Force because he was never Force-sensitive. He was never a Force-user.
Which re-states my theory of what the heck. It would be impossible for Darth Maul to be him when Darth Maul could use the force. Either the people who voted where just kidding or they just did not think. (sorry if it seems like I am flaming lol.)