Chojun Miyagi writings regarding kata in my opinion developed from 30’s to 40’s on a simplified way connecting with Goju foundation. And the view of kata in (1) Heishu as fundamental, showing a close state of mind-body looking to our own inside and basis, more linked with squaring basics, and (2) Kaishu as advanced kata showing an open state of mind-body looking to applications on target bodies, more linked with circular movements, this simplified view as I study, make me believe the profound knowledge he developed studying and developing karatedo with his good partners of the time.
Tensho research begun probably on the 1915 trip to China, and we are looking to a conclusion that with 12 kata, structured 10 Kaishu and 2 Heishu. If one of them is linked with Kanryo Higaonna creation (Sanchin), the other one is linked with Chojun Miyagi innovation. We are on the 100 anniversary of this good moment.
Tensho and Goju are one in Karatedo!