Interesting Gamestop data that contradicts NPD April

[Ail]

In a recent interview with investors ( find more data here on Gamasutra ) Gamestop executives claim that GTA4 did double hardware sales week to week.

That's not exactly what NPD April seemed to hint and in this case we have to believe Gamestop as they have their real sold numbers.

Makes you really wonder about those NPD April numbers...