There was a very strong argument for Chuck Howley winning SB MVP back to back.
He got the award for Super Bowl 5. However, in Super Bowl 6, he recovered the only fumble that Larry Csonka made that season and he returned an INT 41 yars to teh red zone in teh 4th quarter to ice the game..
After the Cowboys punter, Ton Widby, shanked the ball in the 1st quarter, the Dolphins had excellent field position and moved into Cowboys territory. if Howley didn't recover that fumble then it could have been an entirely different game.
In the 4th quarter, behind 17-3, the Dolphins began moving the ball again. This time Howley intercepted a pass and ran all the way to the Dolphins 9 yard line. From there Staubach hit Mike Ditka for the final nail in the coffin. That INT and return was a 14 point swing play.
They didn't consider Howley because he had won it the prior year. Remember, the SB was in it's infancy, appearances mattered. This is also why they didn't consider Duane Thomas. They were terrified of what Thomas might say, especially since he was hanging out with Jim Brown. He had given the press the silent treatment the whole season with some rare exceptions.
So they gave it to our quarterback, Roger Staubach.....no argument there.