As fun as it is to theorize against game matches, I'm not sure it really holds much weight in this contest.
I seriously considered going with Samus, simply because she's a powerhouse in the CB contests. But I'm running with the theory that rivalries will make a huge difference in this contest, so I'm banking on the Boss Duo to get a major powerup, while Ridley holds Samus' head underwater and drowns her.
Of course, I also have Ryu/Ken to the semifinals, so feel free to take my opinion with a grain of salt.
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PSN - Aevio
BlackMageJawa - "I'm on a Goomba."