I think the number of versions of Seisan cover a wider range than just the three versions offered.
From Matsumura Matsumura No Seisan Matsumura Orthodox Seisan (Soken) Kyan No Seisan Shorinji No Seisan There is another version too. Seibukan No Seisan Shimabuku No Seisan Itosu No Seisan Funakoshi No Seisan
From Hiagonna Kanryo To'on Ryu No Seisan Goju No Seisan (many sub variations) Mabuni No Seisan (Shito Ryu)
Tomari Traditions Tomari No Seisan Odo No Seisan
Matoyashi No Seisan Motobu No Seisan Agagaki No Seisan (McCarthy)
Uechi Tradktions there are two different Uechi variations on Seisan Paganoon Ryu No Seisan
It's unfair to lump them together in the quest.
The simplest basic analysis is the underlying embusen, the pattern they all share.
1. Essentially a row of techniques going out. 2. A turn 3. A row of techniques coming back 4. A "+" pattern of techniques.
IMO this much is present in all the versions. Then the issue is the embleshment, the flux, the tidal flow of the form, execution changes, and additions.
If you start looking at the techniques you are getting into the flex of the art, but if you look at the floor, you're closer to the origins (IMVHO).
Every one of these variations is a complete art in themselves. No source version is necessary. But there can be further analysis towards universal underlying application that spans the versions (propriatory analysis of my own). Much simpler than the detail most commonly sought.
Just my thought, but Seisan Prime might be the inner essence of all the above.
-------------------- victor smith
bushi no te isshinryu