You're very right. But try to put yourself in the place of the other person. Of course you and I know that Zelda is an incredibly iconic franchise, but if someone came and told you there's this huge franchise, or character, or company, that everyone knows and you just never heard of it, you'd think it's kind of weird, wouldn't you? At the very least, you'd suspect the other person might be exaggerating.
I'm not saying that, what I am saying is that if there is one, it's either not properly realized or vague enough that there is confusion as to what it is. After all, our latest characters have differed wildly in origins, relevance, fame, popularity, and ownership, so it's not easy to come up with a grand vision that unifies everything. If you say the vision is "the greatest gaming crossover", then why not some bigger characters?
If you want to do more than just insult me, please explain why.