Strong indicator of ZombiU demand - GameStop

[Vinniegambini]

Soundwave said:

Sounds like Zombi U sold about 50-55k in the US ...

http://www.neogaf.com/forum/showthread.php?t=503054&page=39

About half of what Red Steel managed on the Wii in 2006.

Zombi U was the no.2 Wii U software SKU, followed by Scribblenauts and Call of Duty (so those would be sub-50k). 

I don't get it :( On Vgchartz it says 90k and Neogaf says less than 50k. I'm lost honestly.