just can't see it, they don't seem to have any bad blood and they are fairly tight as brothers as far as you can tell.
I don't have a brother but can't imagine having to fight one if I did.It would be a 12 round snooze fest with no one wanting to throw any bombs, I mean can you imiaging either of them them trying to take the other out.
It's a no win situation for both, it would be boring and seen as them lining their pockets.The only thing it would do is take us a step closer to a possible unification situation, but as we know the governing bodies would start imposing their own rules and lists of challengers so that wouldn't happen either.