Look up Koyoshi Pat McCarthy in his book Classic Katas of Okinawan Karate he explains and demos the origin of the three Ryus Shuri-Te, Naha-Te and Tomari-Te and how it was absorbed into both systems. And which Katas came from Tomari-Te how they look what they emphasized. Very enlightening, it makes you wonder why Tomari-Te couldn't have stood as a separate Tode system.

This is a start.