The Nichiren Shoshu/Soka Gakkai Gosho Zenshu is NOT an excellent compilation of Nichiren's works

http://originalbuddhajones.blogspot.com/2008/08/gosho-zenshu.html

Furthermore, the Gosho Zenshu used by the Nichiren Shoshu and Soka Gakkai is the Nichiren Shoshu translation of Nichiren's Classical Chinese and Medieval Japanese into modern Japanese with a Nichiren as True Buddha twist.