It's Bungee's way of showing people how stupid timed exclusives are and how Microsoft really is and I think Bungee is showing a little pay back to Microsoft and giving Sony the year long exclusives.
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Lol seeing how their lead writer left fir Microsoft, I'd say that the payback back fired.
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Considering the guy in charge of the story writing team quit a year before release and went to work for Microsoft id say joke is on bungie given the way Destiny's story looks