Nika Sojo cannot even be the subject of discussion because it was stored at Omosu-dansho (an institute established in Omosu for the purpose of educating disciples; currently Kitayama Honmon-ji Temple), where Nikko lived after retirement, not at Taiseki-ji Temple which Nikko had ceded to Nichimoku, and because its original document is now missing.
二箇相承は日興が日目に譲った大石寺ではなく、日興が晩年隠居した重須談所（現在の北山本門寺）に保管されていたとされる文書である上に、原本は現在では行方不明であるから論議の対象にすらならない。