Sure I know tons of games let multiple people go online at once, many of them requiring only one paid Xbox Live account between the group, but Capcom's BS team would try to say something about how the specifics of the game precluded it somehow. MK9 though offers the exact same mode, 2-on-2 tag fighting with each player controlling one character.
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SuperNiceDog didn't have to reconcile his name...
But Dauntless Hunter is now MrGreenonion