From Gosho Admonitions Against Slander [concluding passages] Major Writings of Nichiren Daishonin, Vol. 1, page 163.
"In the Nirvana Sutra Shakyamuni stated, "If even a good priest sees someone slandering the Law and disregards him, failing to reproach him, to oust him or to punish him for his offense, then that priest is betraying Buddhism. But if he takes the slanderer severely to task, drives him off or punishes him, then he is my disciple and one who truly understands my teachings." Never forget this admonition against ignoring another's slander of Buddhism. Both master and disciple will surely fall into the hell of incessant suffering if they see enemies of the Lotus Sutra and fail to reproach them. The Great Teacher Nan-yueh wrote, "They will fall into hell with evil men." To seek enlightenment without repudiating slander is as futile as trying to find water in the midst of fire or fire in the midst of water. No matter how sincerely one believes in the Lotus Sutra, any violation of its teachings will surely cause him to fall into hell, just as one crab leg will ruin a thousand pots of lacquer. This is the meaning of the passage in the Lotus Sutra, "The poison has penetrated deeply, causing them to lose their true minds."
The Lotus Sutra teaches us: "In lifetime after lifetime they were always born together with their masters in the Buddha lands throughout the universe," and "If one seeks out the teacher of the Law, he will soon attain the way of the Bodhisattva. If he follows and studies under this teacher, he will be able to see Buddhas equal in number to the sands of the Ganges River." T'ien-t'ai interprets this, saying, "One who first began to aspire for enlightenment when following this Buddha will follow him again and attain a stage of faith from which he can never backslide." Miao-lo adds, "One who first hears about the Law from some Buddha or bodhisattva will return to the same Buddha or bodhisattva to attain enlightenment." Above all, follow no one but your original teacher and go on to attain Buddhahood. Shakyamuni is the original teacher for all people, as well as their sovereign and their parent. Because I have expounded this teaching, I have been exiled and almost killed. As the saying goes: "Good advice is harsh to the ear." But still I am not discouraged. The Lotus Sutra is like the seed, the Buddha like the sower and the people like the field. If you go against these principles, in your next lifetime, not even I, Nichiren, can save you."
Following a current Master in the seat of the Law, whether it be Daisaku Ikeda or Nichnyo Shonin, is to practice another religion, or at best, another Buddhism other than the Lotus Sutra Buddhism of Nichiren Daishonin. More precisely, it is to practice a combination of the Chan teachings on the Patriarchal Transmission of the Golden Mouth Ones and the Shingon teachings of Guru Yoga. Please keep this in mind when choosing a Nichiren Sangha.