Since the upcoming DLC will fix the story (if you've researched a bit), you're essentially asking for the next DLC to be free.
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No the DLC is going or should be adding content not going back and fixing the story already in the game.
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But by adding more content it is going to explain what happened in the past, examples such as who is the Exo Stranger and more background about the Hive, Fallen, and Vex. Also there is something called a grimmore that tells a LOT about the campaign.