Oooo, I hadn't considered having Gwaine too. That's a brilliant idea to use the "strength, magic, and courage" bit.

I do need them to be summoned by the bad guys, and not Sam and Dean... my problem is WHY would the bad guys summon them? It has to be part of some other goal, but I just can't think of one. It's driving me nuts.

And sorry for the lack of Twilight reference! I never read the books or saw the movies or anything like that - so... uh, yeah, it honestly didn't cross my mind. :P