Kata Sunsu (SunNuSu) was the creation of Shimabuku Tatsuo.
When he created the kata, he used a variety of sources, namely his instructors.
From Kyan Shorin Passai, Gojushiho and Kusanku
I would like to look at the contributions from Kyan Chotoku, namely his Passai kata.
Here is of Shimabuku Sensei performing his Sunsu kata.
Then to see the Kyan Passai contribution I am going to look at the
Shorinji-ryu of Nakazato Joen. Tatsuo was a senior under Kyan when Joen was a junior.
This is one of his students performing the Kyan Passai kata at the section Shimabuku Sensei used a version of the kata.
You can see for yourself, what the original kata fit into the Sunsu he developed. The similarity and of course the differences.