Does anyone know the differences between the different delineations of Niten Ichi Ryu? What are the reasons for the different schools if it's all from Musashi Sensei's way? Also, why is the uchidachi holding his bokuto upside down?
Branching of schools was a very normal thing. The two most common reasons would be for several dojo to open, often the use of "-ha" would serve to differenciate the dojo lines, like Santo-ha for the main line of HNIR, those would still be said to be the same style though. The other reason is simply a brand new school is formed, but rather than taking a brand new name, they just add the name of the new soke to denote that this is basically this person/family development of the original school, this is most likely what's up with Noda-ha Niten Ichi-ryu. The most renown schools like this are the various Itto-ryu: Mizoguchi-ha, Nakanishi-ha, Ono-ha. But then you have successor schools who don't use this nomenclature like Kogen Itto-ryu or Itto Shoden Muto-ryu. A school is a living thing made up of living people, at some point, after learning Musashi's ways, some wanted to express it in their own terms rather than just following his teachings in an orthodox fashion. There are some known schools that are fairly old like Tetsujin Nito-ryu who is now extinct but who branched from HNIR centuries ago. Usually, when the school is big, well there's only one leader so the high ranking members who aren't him might be tempted to do their own thing for themselves. Let's not forget that for many, Musashi include, martial arts teaching was a job, having your own stuff could add to your credentials or give an air of novelty. Some of the older schools like Katori Shinto-ryu have more than a dozen of descendant schools, who themselves might have descendant schools and so on. Think of it like a religion, even when you have texts and a head (like Christianity), you'll end up with new "schools" with some time. Likewise there's plenty of Buddhists variants who still comes from Buddha's teachings... Your second question is way above my paygrade though, it's really peculiar.
Simple answer is ego. Everyone thinks they are right and they wanna do it their own way. Eventually, everyone's ego starts to cause politics and you get fracturing of the school or the main lineage (if that's important to you). This happens in pretty much all styles and everyone who is licensed to teach is technically "correct" in however and whatever way they wanna teach.
Does anyone know the differences between the different delineations of Niten Ichi Ryu? What are the reasons for the different schools if it's all from Musashi Sensei's way?
Also, why is the uchidachi holding his bokuto upside down?
Branching of schools was a very normal thing. The two most common reasons would be for several dojo to open, often the use of "-ha" would serve to differenciate the dojo lines, like Santo-ha for the main line of HNIR, those would still be said to be the same style though. The other reason is simply a brand new school is formed, but rather than taking a brand new name, they just add the name of the new soke to denote that this is basically this person/family development of the original school, this is most likely what's up with Noda-ha Niten Ichi-ryu. The most renown schools like this are the various Itto-ryu: Mizoguchi-ha, Nakanishi-ha, Ono-ha. But then you have successor schools who don't use this nomenclature like Kogen Itto-ryu or Itto Shoden Muto-ryu.
A school is a living thing made up of living people, at some point, after learning Musashi's ways, some wanted to express it in their own terms rather than just following his teachings in an orthodox fashion. There are some known schools that are fairly old like Tetsujin Nito-ryu who is now extinct but who branched from HNIR centuries ago. Usually, when the school is big, well there's only one leader so the high ranking members who aren't him might be tempted to do their own thing for themselves. Let's not forget that for many, Musashi include, martial arts teaching was a job, having your own stuff could add to your credentials or give an air of novelty. Some of the older schools like Katori Shinto-ryu have more than a dozen of descendant schools, who themselves might have descendant schools and so on.
Think of it like a religion, even when you have texts and a head (like Christianity), you'll end up with new "schools" with some time. Likewise there's plenty of Buddhists variants who still comes from Buddha's teachings...
Your second question is way above my paygrade though, it's really peculiar.
Simple answer is ego. Everyone thinks they are right and they wanna do it their own way. Eventually, everyone's ego starts to cause politics and you get fracturing of the school or the main lineage (if that's important to you). This happens in pretty much all styles and everyone who is licensed to teach is technically "correct" in however and whatever way they wanna teach.
Another great video. Keep up the good work.