A few weeks ago, I shared a video of excerpts from a Seiyunchin seminar I took via Skype with Paul Enfield Sensei, a senior student of Taira Masaji Sensei. Last weekend, he had another seminar on Seisan, where he covered Taira Sensei's approach to bunkai for the entire kata. I didn't attend that one, since I don't know Seisan, but I know that a LOT of people do, so I figured you might want to see it!
Some stuff carries over from the Seiyunchin material, which makes sense, since they are part of the same system. There's definitely good stuff in there!