mario kart was bundled this quater, fairly extensively too,AC' sales have slowed down significantly, which is normal considering the absurdly high sales it did the first months.
It only sold 1 million more than Mario Kart last quarter and this will keep on decreasing.
Both are doing exceptionally well !
but animal crossing will need to slow down as this year was absolutely crazy, this year is going to be a tall order to top.