I think Halo is the game this year that will push the most XBO's...

Forza H will sell well, and will push consoles, but not anything massive.
Sunset Overdrive, I just don't see doing that well.. but then i am not a fan of it's art style.. the E3 trailer also put me off more

Halo will be massive, but i think many users will already own an Xbo for it, I mean these are the hardcore who probably are waiting for a Halo.. early adopters who buy because they know what they are going to get. So I expect the game to sell massively well, and for it to push consoles but probably not a massive amount.... and its coming out toward Xmas... so a pretty good combination.

So, some people still have doubt about the amazon method ?

Not true. Bungie came to Sony. Bungie absolutely loathes MS and is basking in this opportunity to stick it MS. 

You have to remember that Bungie was owned by MS, but wanted out and broke away from MS. They despised the fact that MS wanted them to work on only Halo and nothing else.

The way amazon sales are going, particularly with the destiny bundle, september will be a blood bath. So far the ps4 has been ontop of the xb1 every month on amazon this year, and NPD came out ps4. Now since E3, not only has the ps4 been higher on amazon, but also the destiny bundle. So its somewhat reasonable to assume that the destiny bundle sales are higher than the xb1. so the destiny bundle could sell as many units at launch, as the xb1 sold from e3 until now. and it keeps going.