World at War is not the 5th CoD and yet some people call it "CoD 5."
Anyway, Call of Duty 4 was the last title to feature a major number in its name. Every game after was either a sequel or a spin-off with separate titles.
Since Call of Duty releases yearly, do you think they'll run out of ideas and make a Call of Duty 5? Maybe that one will go back to WW2.
-
Cod 5, is cod 5. WAW isn't a spinoff, prequel, or sequel. All games after WAW I wouldn't say are 6, 7, 8....... because they go off into series