One play. Five yards. A flag that wasn’t thrown. Seven years ago at the Super Bowl, history was made when a 49ers receiver, unable to break free from the prying hands of a harassing cornerback, could not grab a pass on fourth-and-goal that would have given San Francisco the go-ahead score late in the game against the Baltimore Ravens. The Niners lost that game 34-31 and were relegated to the forgettable list of very good NFL teams who came in second place. For the man who threw that pass, Colin Kaepernick, things have never been the same. The same could...