I really believe he thought he did have the right person to let him control the artistic direction. All while not having to dedicate all his time or use his money. I complain about how Kennedy for how she's handling star wars. But I'm not really sure she intentionally bamboozled Lucas. I'd guess it was mostly Iger. He's the one who threw Georges scripts in the trash.
It all seems to point to Iger saying, yea George, we'll buy star wars and you can be the creative consultant, it'll be great. And as George walked out the room, scripts in the trash while under his breath he says sucker. I'd bet Kennedy didn't fight it, but what's she going do? When your boss says we're going in a different direction, you do what you're told.