In chapter [11] of the sutra, Śākyamuni’s emanations materialize, having been asked to gather from the ten directions. Chih-i had already suggested that the emanation-bodies of Śākyamuni prove that he had not attained enlightenment only forty years before preaching the Lotus Sutra, otherwise there could not have been so many kalpa-old beings who had received instruction from him. However, Chih-i did not invest Śākyamuni’s emanations with a universal significance, probably because he did not regard Śākyamuni as the only true Buddha of the universe. Nichiren’s declaration that all Buddhas enlightened in the past are emanations of Śākyamuni is of a different nature: it challenges the equality of all Buddhas and, furthermore, operates as a reduction which unifies all Buddhas, not only those appearing in the Lotus Sutra, but also those appearing in other scriptures of the Buddhist canon. It should be noted that this “absolutization” of Śākyamuni, although reminiscent of the idea that “all Buddhas are just one single Buddha” developed by esoteric Tendai in Japan, does not proceed by equating Śākyamuni with another Buddha already defined as universal, like Vairocana, but rather by including all Buddhas (Vairocana, too) in the person of Śākyamuni.

Nichiren discusses at length how all Buddhas are enlightened because of their relation to Śākyamuni Buddha.

If we consider the stage of results, the many Tathāgatas are Buddhas of a past ten kalpas, one hundred kalpas or a thousand kalpas long. Lord Śākyamuni is a Buddha who has [attained] the complete result of subtle awakening as many kalpas ago as five hundred particles of dust. The various Buddhas of the ten directions such as the Tathāgata Vairocana, the Tathāgata Amitābhā and the Tathāgata Bhaisajyaguru are followers of our original teacher, the Lord Śākyamuni. One moon in the sky floats in the water as ten-thousand [moons]. … This Buddha Abundant Treasures, too, is a follower of the Lord Śākyamuni of the chapter “The Long Life of the Tathāgata.

Nichiren’s interpretation of the Śākyamuni of the Lotus Sutra, although it took as its point of departure Chih-i’s theories, was definitively influenced by various hermeneutical patterns that developed in the Japanese exegetical tradition of the Lotus Sutra, and by Nichiren’s personal experience of the reality disclosed in the scripture.

Nichiren reread the entire sutra focusing on the “section of the origin.” From this perspective, he constructed an image of Śākyamuni Buddha as the only true Buddha of all Buddhist systems, and eventually produced an interpretation of the Lotus Sutra very different from that of Chih-i. In Nichiren’s writings we find a sort of dilation of the chapters constituting the second half of the Lotus Sutra, especially the end of chapter 15 and chapter 16, which Nichiren judges to be almost exclusively representative of the meaning of the entire scripture. This corresponds to the dilation of the temporal dimension expressed in those chapters, that is, the distant past in which Śākyamuni obtained his original enlightenment. Nichiren absolutizes this original moment and makes it the only significant time and relates it to the existence of humanity in a certain time and place.

He writes:

The true attainment of buddhahood in the far distant past is the original ground of all the Buddhas. To use a metaphor, if the vast sea is the true enlightenment in the past, the fishes and birds are the thousand two hundred and more Venerables. Had the enlightenment in the past not occurred, the thousand two hundred and more Venerables would be without roots like duckweed. …

When the past [of Śākyamuni] and [his] eternal abiding are disclosed, all Buddhas become Śākyamuni’s emanations. At the time of the earlier sutras and of the first part of the Lotus Sutra, the various Buddhas performed each practice and each discipline side by side with Śākyamuni. … Now it is manifest that the various Buddhas [of other sutras] all are followers of Śākyamuni. … When the Buddha is the Buddha of the far distant past, even the great bodhisattvas of the “trace section” and the great bodhisattvas of other realms are disciples of the Lord of the Doctrine Śākyamuni.