Saicho took Taihan with him to go twice to visit Kukai and persuade him to bestow the dharmic succession ritual of the Diamond Realm on him, but Taihan refused (this led Saicho to go in 812 without Taihan, accompanied by other disciples, to see Kukai, who then granted him the dharmic succession ritual of the Diamond Realm).
最澄は泰範に共に空海のもとで金剛界の灌頂を受けようと2度にわたり説得するも断っている（このため最澄は泰範以外の弟子らと812年（弘仁3年）に金剛界灌頂を受けている）。