"Fans continue to show their excitement for new generation Xbox One games, with U.S. consumers purchasing an average of 2.9 games* per console since launch.
*retail and digital (internal Microsoft data)"
PS. I don't know why did you posted this Aaron's tweet... he is talking about 4.8m retail... 5.2m is retail + digital... for a console supposed to be digital only 400k units is really low.
It does look quite low compared to the 360 , also what were the digital sales of the PS4?