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Combat sports are built on mano-a-mano, “What if?” concepts. What if a beloved fighter from yesteryear donned the four-ounce gloves once more today? What if the best fighters in their divisions advance up in weight for mega-fights? What if a rematch that should happen never does? All these questions follow former Ultimate Fighting Championship welterweight titleholder Georges St. Pierre, and the man known as “GSP” should never answer them.