Who is the true Buddha?

"The Thus Come One Shakyamuni is the true Buddha who gained enlightenment in the inconceivably remote past." -- On the Protection of the Nation

This one sentence from the writings of Nichiren Daishonin puts to rest the false 550 year teaching of Taisekeji/SGI that Nichiren is the True Buddha.*

*The first mention of the idea of "Nichiren as True Buddha" surfaces in the 15th Century in the Gonin-shohasho-kenmon of Nichigen, the head priest of Nishiyama Honmonji temple. Nichigen and Nichiu, the 9th High Priest of Nichiren Shoshu, were friends and so it is probable that Nichiu got the idea of Nichiren as the True Buddha from Nichigen.