Nova 6 origins (outside of the canon of zombies)

As I'm sure a lot of you know, Kino Der Toten was originally supposed to be a world at war map, and Der Riese teased it in the usual ways zombies maps used to do (game over theme being the next easter egg song, some stuff in the map itself teasing future content). And one of those things teasing Kino (or at least the future of zombies in general) was when you use a teleporter in Der Riese, you can briefly see a Nova 6 Crawler (an older design of it, as seen in the bottom right of this pic). My question is, what came first? Nova 6 in zombies or in the campaign of Black Ops 1? There's a lot of shared writers between zombies and the campaign, and by the time Kino was being worked on during world at wars dlc cycle, the Black Ops 1 campaign was definitely already in the works, so I just wonder what Nova 6 was first conceptualized to be part of? Zombies or the campaign? Were the original world at war crawlers just going to have a different effect upon death or none at all if the idea for Nova 6 was first made for the Black Ops campaign? What could this have changed in the long run over the course of the zombies story? Would Alpha Omega be a better map had Nova 6 never been incorporated into zombies? This is an incredibly important question I assure you all.