Diomedes, your forgetting the X360 price dropped, and it's a Japanese game. The higher a Japanese game does, the more X360's move. Look at Beautiful Katamari - it moved 3k consoles.
Not only that, according to Media Create, X360 hardware was actually higher last week with no new software titles - a good sign for AC6.
Hardware *could* be anywhere from 6k at the bare minimum, to 10-12k max.
Back from the dead, I'm afraid.