As I mentioned, in my personal training, I attended the TAIKAI with Hatsumi Sensei over the years, my intention will be to attend Taikai by the different Soke, not just the "general" Ninjutsu training, but in the specific Ryuhu they are now head of
As an existing Shidoshi, I would look to take the opportunity to advance my training in "fifth dan and above" for these Ryuha
I will then pass this down to the Tigers
KOTO Ryu under Noguchi
GYOKKO Ryu under Ishizuka
SHINDEN FUDO RYU under Nagato
would be my first interest - and these Shihan would still be teaching the entire NINPO system, not just their specific Ryuha
I will consider further training under Manaka in his JININKEN school
and TANEMURA in his Genbukan school
as I have trained with all five of these SHIHAN over the decades
Maybe parallel or later I would look for instruction in the specific Ryuha from the new Soke
TOGAKURE RYU under Tsutsui Takumi
KUKISHINDEN Ryu under Iwata Yoshio
TAKAGI YOSHIN RYU under Sakasai Norio
GIKAN RYU also under Norio
GYOKUSHIN Ryu under Kan Jun'ichi
KUMOGAKURE Ryu under Furuta Kōji
I do not personally know these Shihan yet, and have no interest in their interpretation of the "overall" Ninpo, I would be looking for training in their specific Ryuha
This is, of course, at this point, my intentions for my personal training over the next decade or so, though part of my SHIDOSHI development is to practice and teach what I learn back at my own Dojo, in this case STMA
As mentioned, it is possible that future training in some RYUHA will be done under the next SOKE, the current Soke's successor