As much as I dislike them, the keyword in amongst all of this is "if". Let's be honest, there aren't many people, if any people about that can beat one of them let alone both.
Plus if one of them did get beat, the public would be pushing for the winning fighter to fight the other brother anyway, so I don't think it's that much of a bad thing. Beat them both, you go into the HOF, it's a good opportunity, if only someone was able to take it.
Bookmarks