Genso-eko means that one is endowed by Amida Tathagata with the ability to attain birth in the Pure Land of Amida Tathagata; to fulfill the practice of concentration and observation; to gain the power of enlightenment; to return to the world of birth-and-death, i.e. this world; to convert all sentient beings; and guide them to follow the way of Buddha together.
還相回向というのは、阿弥陀如来の浄土に往生して、止観行を成就し教化する力を獲得し、生死の世界、つまりこの世に還り来たって、すべての衆生を教化して、一緒に仏道に向かわせようとする力を、阿弥陀如来から与えられること。