The victory banner symbolises the victory of the activities of one's own and others body, speech and mind over obstacles and negativitities. It also stands for the complete victory of the Buddhist Doctrine over all harmful and pernicious forces.
Maitreya, "'The Benevolent" is turning the Wheel of the Iaw (dharmachakra mudra) in the Tushita Heaven. There as a Bodhisattva he teaches Buddhist doctrine to celestial beings until he descends to this world as the future mortal Buddha.
Divine Wisdom 1957 - from “Nichiren Seijin Goichidai Ki Gafu” (Picture Album of the Life of Holy Priest Nichiren). Tenrei Horiuchi «Yaku-o-maru wanted to gain the divine wisdom to be able to study the complicated Buddhist.