Nichiren's reasoning versus SGI's and NST's back asswards reasoning

"Question: The sutra passages you have cited clearly prove your point. But are there any prophecies in the writings of T’ien-t’ai, Miao-lo or Dengyo that would support your argument? 

Answer: Your process of questioning is backwards! If I had cited passages from the commentaries of men such as T’ien-t’ai and the others and you had then asked whether there were sutra passages to support them, that I could understand. But since I have already cited passages from the sutras that clearly prove the argument, it is hardly necessary to ask if there are similar passages in the commentaries. If by chance you found that the sutras and the commentaries disagreed, would you then discard the sutras and follow the commentaries?" -- Nichiren