I came across this link http://www.ekisuikan.com/newpage8.html
Maybe this is common knowledge to some of you but to me it was quite shocking / enlightening about the history. It gives the lineage but also who did what and in some cases where they were from. Eishin ryu not originally from Kochi? I found it interesting, hope you do too.
Also there are a lot of pictures on there that if you open them in a new window they are full size and have the names of all the people on them in japanese. A number of them feature Oe sensei.