The teachings expounded for forty-two years in the pre-Lotus sūtras were all expedients designed to lead people to the Lotus Sūtra. We know this because the Sūtra of Infinite Meaning says: “I sat under the bodhi tree for six years to attain enlightenment! Though I expounded various expedient teachings to guide people, I did not reveal the True Dharma for forty years or so. The expedient teachings expounded for forty years or so are the Agama sūtras, which I expounded first to teach the doctrine of the Four Noble Truths of suffering, and the way to Nirvana. I then expounded the twelve types of scriptures of the Hōdō period, the Great Wisdom Sūtra, and the Flower Garland Sūtra while in the ocean-imprint meditation.”

Personally, I think that the order in which the Buddha preached was the Flower Garland Sūtra followed by the Agama sūtras, the Hōdō sūtras, the Wisdom Sūtra, the Lotus Sūtra, and finally the Nirvana Sūtra. To rank them in the order of profundity in doctrine from superficial to profound, it should be the Agama sūtras, the Hōdō sūtras, the Wisdom Sūtra, the Flower Garland Sūtra, and the Lotus-Nirvana Sūtras. So it is stated in the Lotus Sūtra and the Nirvana Sūtra.

Ichidai Shōgyō Tai-I, Outline of All the Holy Teachings of the Buddha, Writings of Nichiren Shōnin, Doctrine 3, Page 79-80