That implies that the only account that you can be 100% certain about is Q. I don't think it means that some of the other accounts aren't also good. That part is going to be vague. Some of the other accounts in may, or may not be good. The only one you can rely on his Q, however. That's actually similar to the Orthodox view on Christianity. I think Roman Catholics believe this too. 100% certainty that Jesus Christ is the only path to salvation that we know of. But that doesn't mean that God doesn't have other paths to salvation. And that's just common sense. He's not going "Bill Gates" 5.8  billion people who weren't exposed to Christianity.