Danny wasn't born a ninja. He was lost and couldn't find his way, then the evil E took him in and trained him with the dark forces of ninjaisim. Poor Danny had no guidance and accepted this offer. Soon he was using his powers and was trained with Ninja training: weapons. He became even more dark and deadlier, that he STOLE WAYNE'S VIOLET SHOELACE! Wayne quickly realized he was no match for the almighty god-like Garcia, so he too had to take up Ninja training to get his shoelace. Wayne is still undergoing his training so that maybe, one day he can find his shoelace. Theory 11 is Wayne's search party for his shoelace and they have sworn against all born Ninjas (and poor Danny), but little do they know a NIT (Ninja In Training) is right under their noses.
Now back to my opinion, I wish Danny would join but I doubt he will. I would love if he joined (for he is a genius). Maybe Chris Kenner can perform a ceremony to forgive Daniel Garcia of his Ninja sins, so he can be accepted into our cardistry and magic underground epicenter.