Thing is, Merc don't rerally care about which of their drivers wins the WDC, like LeMans, it's far more important for them, and the sale of their cars to have a nice picture of a 1-2 finish and podium in every race. Having them on strategies that mean it's hard for them to get too close to eachother (even if the driver behind is capable of it) which removes the element of 'will they hit eachother?'.
And without pointing any fingers, the answer is 'maybe', which is no good for the WCC and leaves you with two pissed off drivers, rather than one.
So, Nico needs to stick it on pole and convert that to race wins by controlling the race from the front, as then catching and overtaking him on the second-best strategy is Hamilton's problem, not his.