Timeline Theory
If you try to wrap your head around the continuity issues of these films, you're likely to go insane. So before I go nuts, I'd like to throw this out there to see if anyone thinks this would make sense.
Is it possible that Curse takes place sometime after Legacy? Ignoring the fact that Legacy showed some footage of 6, there's no mention of Tank or the events of 6. Maybe that's why we can't figure out how McGrew purchased them at an auction, because they have yet to set that storyline up?
Just trying to make sense out of nonsense. What do you guys think?