You can't add N factors to multi factor authentication by adding more accounts. That's just lightly strengthening the first factor (something you know which is a few different accounts) with a splattering of the second factor (those accounts rely on something you have such as your phone). The third factor of something you are doesn't even come into play in this solution.
Having 2FA set up for the account in question makes it reasonably secure. Relying on a second account that also has 2FA enabled does not make it twice as secure. It might make it slightly more secure but not by a lot. It's even likely that the second account is using the same device for the second factor as the first account which negates any added security.
The best you can do in a scheme like this is shift the trust based security to second entity. It's the same level of security but just handled by something you might trust more. (Google/Facebook vs some random website I had to make an account for).