Regarding your first point about utilizing SGI sources, Nichiren made use of the commentaries of even those he considered to be slanderers of the Dharma, for example, the following passage from the Learned Doctor Shan-wu-wei in the Opening of the Eyes...
Nichiren didn't make up the excrement cake analogy. You did.
Regarding your second point, Nichiren is very clear, "...when the two characters for namu are prefixed to Myoho-renge-kyo, or the Lotus Sutra of the Wonderful Law, we have the formula Namu-myoho-renge-kyo." [not Nam Myoho renge kyo].
Actually, the "two characters" are 南無, not "namu" or "nam". "Namu" is the transliteration of how some Nichiren Buddhists pronounce 南無. "Nam" is the transliteration of how other Nichiren Buddhists pronounce 南無.
Just stop. You're grasping at straws. You don't speak Japanese, you apparently don't really understand how the writing system works, and yet you continue to make these grand arguments that maybe get lapped up by people more clueless than you, but actually reveal you have know idea what you are talking about.
Regarding your third point, again, Nichiren is very clear in this passage from the Sado Gosho. What is there to discuss. Those who practiced principally shoju and who criticized him, he considered 'renegade disciples.
Right. Also from Opening of the Eyes:
From your preferred Soka Gakkai translation of Kaimokusho, WND 285
When the country is full of evil people without wisdom, then shoju is the primary method to be applied, as described in the “Peaceful Practices” chapter. But at a time when there are many people of perverse views who slander the Law, then shakubuku should come first, as described in the “Never Disparaging” chapter...
In the Latter Day of the Law, however, both shoju and shakubuku are to be used. This is because there are two kinds of countries, the country that is passively evil,220 and the kind that actively seeks to destroy the Law. We must consider carefully to which category Japan at the present time belongs.
Which category does the U.S. belong to?
It doesn't matter. If you go back over my posts, my question of you is not that you chose Shakubuku, its how you carry it out. Your writings are all over the internet and speak for themselves. You don't live in 13th century Japan, you live in 21st century America. But that's how you roll. You're like the character from Confederacy of Dunces who talks like a medieval monk in 1960's New Orleans. Not only do most people not speak Japanese, they don't speak Buddhism, let alone medieval Japanese Buddhism.
Anyway, Never Disparaging's practice from the Lotus Sutra https://www.bdkamerica.org/digital/dBET_T0262_LotusSutra_2007.pdf
“After the parinirvāṇa of the ﬁrst Tathāgata Bhīṣmagarjitasvararāja, there were excessively proud and overbearing monks in the Age of the Semblance Dharma, after the True Dharma had been extinguished. At that time there was also a monk, a bodhisattva, called Sadāparibhūta (Never Despising). “O Mahāsthāmaprāpta, why was he called Sadāparibhūta? Because whenever he saw any monk, nun, layman, or laywoman, he would praise and pay homage to them, saying:
I deeply respect you. I dare not belittle you. Why is this? Because all of you practice the bodhisattva path, and will become buddhas.
“Furthermore, this monk did not concentrate himself on reciting the sutras but only paid homage such that, even when he saw the fourfold assembly from afar, he would go up to them, praise, and pay homage to them, saying:
I dare not belittle you, because you will all become buddhas.
“In the fourfold assembly there were some whose minds were impure and who became angry, and reviled and disparaged him, saying:
Where does this ignorant monk come from? He says that he himself does not belittle us and predicts that we shall all become buddhas. We do not need such an idle prediction.
“In this way he wandered about for many years and was always reviled. But he never got angry and always said, ‘You will become a buddha.’
“Whenever he spoke these words, people would assail him with sticks or stones; he ﬂed from them yet still proclaimed loudly at a distance:
I dare not belittle you. You will all become buddhas.
Lastly, Sado Gosho is in the Rokunai collection. So, if it is a forgery, it is a very early forgery from right around the time of Nichiren's death. The Kempon Hokke does not dispute its authenticity.
You know that just because a writing appears on that list, it does not mean it has not been tampered with over the centuries.