@jeanroygrant: I'm not for a second saying that in a front on confrontation Thor wouldn't win. But let's be honest, that's not how Daimon fights. In that mini he tricked Isis and Osirus into defeating their own goals. In doing so he upset his fathers plans in a mega way (and pissed him off to boot). Knowing he'd done that he put his soul in a vessel and then in a safety deposit box (after all that's the only way to destroy someone like him or his father). He actually didn't DO anything much at all. His father who let's face it is depicted as the king of tricksters (above even Mephisto and Loki etc) only half suspected that he had something up his sleeve.
In a head on power battle Thor wins hands down. Not questioning that at all. But Daimon doesn't take the front door into battle. he's his fathers son and if he can get you through the back door with your hinie showing than that's how he'll do it. Thor wont even know he's been tricked until it's too late and Daimon's free and clear.
@beatboks1: good point. Loki does trick Thor quite a bit