Nichikan's and Ikeda's role is to subborn True Buddhism.

The Eternal Buddha Shakyamuni's role is to be the object of worship in terms of the Person. Our role is to worship Him. Nichiren Daishonin's role was to reveal the object of worship which he taught,  " is in no way my invention" [because it is impossible to create [or invent] that which is uncreate and eterrnally enlightened]. Our role is also to spread the five or seven characters of the Daimoku and the object of worship that Nichiren Daishonin revealed. Nichikan's and Ikeda's role is to subborn True Buddhism.