Saichō did not live long enough to work out a thorough synthesis of esoteric Buddhism and the one-vehicle teaching of the Lotus Sūtra, and the task would be carried on by his disciples. The integration of Tendai/Lotus doctrine and the esoteric teachings (enmitsu itchi) would become a major feature distinguishing Taimitsu—the Mikkyō that developed within Tendai—from that of Tōmitsu, the Mikkyō of Kūkai’s Shingon tradition, and was essential to the development of medieval Tendai hongaku thought. (Page 21)