And now do the same with all the stuff which doesn't represent reality. I mean, you do it only with the stuff where it works but you could do the exact same thing to "prove" that Amazon charts don't work to represent the real situation.
The chance that something which is in front on Amazon is also in front at NPD is pretty obvious. You could do it even in a small store which sells 10 consoles a month and your average chance would be higher to get the real result since every single retailer is one part of the whole market.
As wider the gap between two consoles in whole America as bigger the chance that Amazon will represent the same result and as closer they are in whole America as bigger the chance that Amazon charts won't represent the real result.
But I can't really take you serious when you say your "bububut" in so many posts. I think you got that from M.U.G.E.N who did the same all the time.