You're wrong. Zelda has a lot of things going against it which Mario doesn't. As you said it was never bundled so it wont get free 5m sales or whatever Mario already gotten. Its on Wii U meaning if you have a Wii U and now own a switchs you might not even pick it up for switch but you definitely getting Mario. Now because its a Wii U game it unfortunately is available for PC as well which should hurt sales additionally (PC version of BOTW is the best version of the game hands down). This and the fact that Mario Odyssey has already outsold it and it came out 7 months after i don't see how Zelda will ever catch up.