I think XIII-2 will ultimately outsell Crisis Core, but it won't be by much. It'll still be profitable, because it reuses many of the same assets and has a much lower budget that the original, but the comparison is X-2, not Revenant Wings. XIII-2 has far more in common with a new mainline game than it does the two portable games.
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"When I was a young man, I had liberty, but I did not see it. I had time, but I did not know it."