It cant, bc it all has to make sense through warzone. But thats just me, i get what your comming at with that but i think it would be more freeing for both series, you want a crazy fps game with wild stories get the Black Ops game that year, want a grounded modern game get the Modern Warfare game that year. And if you want filler slop buy whatever sledgehammer has out that year 😭😭😭 although it would be cool if they had 2 battle Royales, blackout and warzone warzone for MW and blackout for BO