You're all talking about getting sucked into the void, but I seem to remember 4 regular people not getting sucked into the void either. If they can avoid it, Kefka can easily. Before Kefka had the power of the statues, he kinda sucked. But after that, no magic can hurt him, and he's just crazy powerful.
Plus storywise Kefka is far cooler. Ex-Death was pushed too hard to be this awesome bad guy, but he failed, kinda like Sephiroth
THE JACKEL