CS,
when Moschiach comes, we – hopefully – all accept him. Before that, you may try to think how you can make the world into a better place rather than idly speculating who M might be. There is no special mitzva to be the best guesser as far as I know.
Maybe it will help us (and you yourself) understand your position better if you could describe how it came to your mind to spend time speculating about who M might b. Did you read it in sichos? a yeshiva teacher? your parents? a Gemora? something in Tanach?