Mercedes manufactured the title for Rosberg German Driver German Team ! Vettel had no intention of passing Rosberg German driver again We have just had Brexit because we don't trust the Germans .
In my thoughts Mercedes realized that without help Rosberg was never going to win a world championship He is 31 Hamilton is also 31 BUT has 3 world titles behind him .Maxy will have 1 or 3 world titles before he is 31 too AND once a driver gets married has children every man and his dog knows that the speed drops with the wifey reminding them "Have a good race BUT remember me and Daisy" So he becomes more cautious and slower Cannot see Rosberg EVER winning another world championship !