Going through my video library I have come across an old video that captures the possible evolution of Sanchin kata.
On the video we can see demonstrations by the following masters:
Pan of Yong Chun Village – Yong Chun White Crane ,
Chen Jian Feng – Wushu Guan,
Shinyu Gushi – Pangai Noon (Uechi Ryu)
Morio Higaonna – Goju Ryu
I think this video represents a great visualisation of the possible development route of this kata.
At the link below you can find some bunkai performed by Sensei Ryan Parker