Interestingly my first thought was changing to a 1 stop caused there to be less rubber left on the tires compared to a 2 stop strategy but dismissed it thinking it couldn't have made that much of a difference.
So, with Russell, are the cars weighed with or without tires? Interestingly, they turned back up the pit lane instead of a parade lap. So no one had the opportunity to collect any marbles on their tires.