So that means the XB1 was tracking ahead of the 360 in 2016. That means XB1 sales by the end of 2016 were more than 28m. Someone earlier said that the XBO by the end of 2009 was 37m so XBO should be around 35-36m by the end of last year.
XB1 dropped off a cliff after the Scorpio announcement. This whole year ww sales have been more like 3:1 instead of 2:1 in favour of PlayStation. I’d even say actual VGC numbers of 34mio are exaggerated since they traditionally overtrack XBox with no chance of correction this gen.