Nichiren can't do it alone. What makes you think the High Priest can?

Nichiren Shoshu member:

"It is central to the mystic law, that the Law itself is transmitted to a single individual. This is a good thing. "

Nichiren Daishonin:

"Lands at the beginning of the Latter Age slander the true dharma and those who live there have poor capacity for comprehension and faith in Buddhism. Therefore, instead of relying on Buddhas from other worlds, the Buddha called out great bodhisattvas from underground to entrust them with the task of transmitting the five characters of Myo, Ho, Ren, Ge, and Kyo, the essence of the 'Duration of the Life of the Buddha' chapter, to the people in this world. It meant also that those guided by the teaching of the theoretical section were not the original disciples of Sakyamuni Buddha." Kanjin Honzon Sho, Nichiren Shu (NOPPA 1991) p 126; MW I:73.

"Having thus manifested the ten divine powers, Sakyamuni Buddha transmitted the five characters of Myo, Ho, Ren, Ge, and Kyo to the original disciples of the Buddha since the eternal past, who had sprung up from underground." Kanjin Honzon Sho, Nichiren Shu (NOPPA 1991) p 140; MW I:76.

"Tien-tai comments on this in his 'Words and Phrases of the Lotus Sutra': Following 'Thereupon Sakyamuni Buddha said to the host of bodhisattvas', is the third section of the chapter on the Divine Powers, summarizing the essence of the Lotus Sutra and transmitting it to the bodhisattvas from underground." Kanjin Honzon Sho, Nichiren Shu (NOPPA 1991) p 142; MW I:76.

"The manifestation of the ten divine powers in the 21st chapter on the Divine Powers' is for the sake of transmitting the five characters of Myo, Ho, Ren, Ge Kyo to the four bodhisattvas of Jogyo, Muhengyo, Jyogyo and Anryugyo, representing the host of bodhisattvas who had sprung from underground." Kanjin Honzon Sho, Nichiren Shu (NOPPA 1991) p 142; MW I:76-77.

"Now we are at the beginning of the Latter Age of the Decadent Dharma, when Hinayana teachings strike down Mahayana teachings, provisional teachings destroy true teachings, east is taken for west and west for east, and heaven and earth are upside down. Under these circumstances, the four ranks of bodhisattva-teachers who preach the theoretical section of the Lotus Sutra remain in hiding. Gods desert the land which they are supposed to protect. Then, for the first time those bodhisattvas from underground appear in this world to encourage ignorant people to take the five characters of Myo, Ho, Ren, Ge, and Kyo, the excellent medicine of the Latter Age."(Kanjin Honzon Sho)

The transmission is to all the Bodhisattvas of the Earth. Nichiren can't do it alone.