Which Cowboys defensive lineman shared Super Bowl XII MVP with teammate Harvey Martin?

Which Raiders quarterback won Super Bowl XV MVP? Which Steelers receiver won Super Bowl X MVP with acrobatic catches? Which Steelers receiver won Super Bowl XL MVP? Which Steelers receiver won Super Bowl XLIII MVP with a late toe-tapping touchdown catch? Which Cowboys cornerback won Super Bowl XXX MVP? Which Buccaneers safety won Super Bowl XXXVII MVP? Which Bears defensive end won Super Bowl XX MVP? Which Cowboys linebacker won Super Bowl V MVP even though his team lost?