This is what needs to be remembered:
MONTH PS4 XB1
January 227k 130k
Febuary 404k 248k
March 330k 241k
April 178k 167k
May 207k 107k
June 234k 211k
July 161k 171k
August 160k 274k
September 285k 332k
October 235k 329k
November
December
2016 TOTAL 2421k 2012k
Even thought the Xb1 has taken a few months, its still behinde in the USA sales wise for 2016.
Then factor in the PS4pro moveing sales from Aug/Sep/Oct -> November.....