Stephan Kesting at Grapplearts has interviewed Alex Kask of Bichu Den Takeuchi-ryu a few times. I enjoy the comparison and contrasting without the typical "us vs. them" BS that you see from both traditional and modern camps. Good stuff!
https://www.grapplearts.com/japanese-jiujitsu-vs-bjj/
http://kesting.libsyn.com/148-enviro...with-alex-kask