So Nintendo (and other companies) putting cameos into their games mean that every game happens in the same galaxy? And this theory is strengthened by Mike Tyson making appearances in games, too…?
It might be "just a theory", but he's begging the question hardcore by making these leaps. It's a great idea, but you can't cherry pick a hundred cameos and tell me that they're all on the same planet (also, this is a great time for me to mention that it's spelled "world"… :/). True, it would be nigh impossible to provide hard evidence to assert the claim that all games occur within the same galaxy, but using cameos and references to back yourself up is just a terrible approach.