I think you need to look at time in the art also...due to the fact that in the bujinkan you can come across a 5th dan that has been training for 3 years one that has been training for 25 years. Rank means nothing. It's time put in.
But training for 25 years under someone who has not received full transmission, is not recognized by a traditional Japanese organization, or has been separated from these factors by a matter of degrees due to being a part of an independent school...what does that mean? Does that also mean "nothing" in terms of being recognized as a qualified practitioner or teacher of Ninjutsu?
The conundrum seems to be:
- one has practiced authentically (to an extent) Ninpo, but without oversight by a recognized entity in from Japan.
- one has practiced authentically Ninpo, in Japan, with oversight by a recognized entity but in a ryu that is not considered "All Ninpo, all the time" or that has promoted unskilled teachers.
-one has started off with a recognized entity/teacher, practicing authentically, but then branched off into an independent school, thus breaking the chain of lineage and the continuous reinforcement of transmission.
Which leaves a person to wonder, what makes a style authentic?
If a person legitimately trains for years and dedicates her life to an art, but never gets graded or receives transmission from a recognized Japanese authority, then is that person an authentic practitioner (not qualified to teach, just very, very skilled, adept, and knowledgeable in practice)?
What about those that have vast resources of knowledge, owns many books, weapons, or possibly even a school, speaks/reads/writes fluent Japanese,
and has dedicated their entire life to the art, yet is one degree removed from a Japanese authority, due to being an independent ? Are they qualified to teach "authentic" Ninpo?
Finally, I call Ninpo, Ninjutsu, et. al., a "lost" art because there is so much dispute over what was actually practiced historically, or even the nature and contents of that practice. A lot of speculation exists, which puts serious and dedicated enthusiasts in a difficult position. Either to embrace the Bujinkan (and other "X-kans") where they will not necessarily be given full transmission or even the full catalog of knowledge, but rather focus on Taijutsu (at which point one is not Ninja, but Taijutsuka that knows a bit about Ninpo), or go off on your own to either join or establish a "real Ninja" school....with no living connection to Japan, thus embracing the art but not being recognized by any official organization. This is not usually the case with traditional JMA which were "sporterized" post WWII, but were revived as their budo form later on, thus preserving the living connection with the original form, because there was enough evidence recorded and living practitioners around to know definitively what the form consisted of.
Unfortunately much of the anthropological data about Ninpo is in dispute, so one just has to rely on A). lineage or B.) faith or both to consider oneself an authentic Ninja. And even then...