all Buddhas, including the ancient Buddha Many Treasures, are followers of Shakyamuni Buddha

"The Vairochana Buddha seated on the lotus pedestal with other Buddhas surrounding him in the ten directions, who is described in the Flower Garland Sutra, and the Thus Come One Mahāvairochana of the Diamond Realm and the Womb Realm, who is described in the Mahāvairochana and Diamond Crown sutras, are attendants who stand on the left and right of the Thus Come One Many Treasures, the Buddha described in the “Treasure Tower” chapter of the Lotus Sutra. They are like two high ministers in attendance on a worldly ruler. And this Many Treasures Buddha is a follower of Shakyamuni Buddha, the lord of teachings of the “Life Span” chapter." -- Nichiren

Why not Daisaku Ikeda and the SGI members?