Re: Christian Feminists? Oh, the irony.
I get the point you're trying to make, and I was just sharing something shared with me, however I think her point was this: He's not trying to prove to himelf or his people that he is a better ruler, he's trying to prove to Satan (who thinks he's a better ruler than god) that he is a better ruler. He's trying to show Satan that his beliefs are wrong, and also set an example for all to come why he is a better ruler so no one becomes like Satan ever again. It's not like he intends to allow Satan to run things forever, and (according to the Jehovah's Witnesses, anyway) when he does get rid of Satan, he intends to make the Earth a paradise again.
I'm not the person who said this, nor am I really religious, so I can't do much more than tell you what I took out of it, but much like you said, I hope that makes sense.