If Tenkai was Mitsuhide AKECHI, he would have died at age 116 (recorded as 108), which is difficult to believe judging from the average life span at that time.
また、天海が明智光秀であるとすると、116歳（記録では108歳）で没したことになり、当時の平均寿命からみて無理が生じる。