So just for rough ballpark figures, lets say that XB1 is sitting at 450k in the UK, and the XB1 version of Titanfall sold those 125k units (PC will be pretty negligible). That works out to a 28% attach rate.
Assuming that US sales will be ~2.5M by the end of March (maybe slightly higher), a similar attach rate would give Titanfall around 700k sales in the US.
PC sales won't have been negligible in the UK , gimme a break.
And the thread is about hardware sales , not how many copies TF will sell.
Given how front loaded games sales are it seems trying to work out US monthly sales using 3 days of UK sales data is nuts. These numbers won't continue for the remainder if the month here.