Before I finish digging into the transition between the 1890s and 1920s, I found someone made a relationship graph of all the key people involved in the creation of Hoensha
http://igoshi.blog.fc2.com/blog-entry-691.html
The red lines mean blood relationship, the blue lines indicate teacher-pupils, the purple lines are adoption, the green lines are marriages, different colors in the blocks indicate different houses.
I feel it is definitely interesting enough, if someone wants to write a novel, or make a tv series, or movies out of this love-and-hate mess where modern Go born out of it.