Back in August when pre orders for the halo 5 bundle went up, it placed at #24 on the Amazon monthly charts. The following month of September it didn't even make the top 100 monthly.
And until a few days ago, it was struggling to get out of the 80s and 90s range. So most pre orders are occurring now rather than before.
Not to mention the horrible charting of the current Xbox bundles, and we may see sales for October in a pretty low number compared to what many ppl are expecting.
I still think Microsoft will win the month, but I don't think it'll be by as many units as some are expecting.