I imagine the divine doctor being eccentric, just hoping to watch an anime he used to love back on earth the Rui uses his mental projection to play a video and they become best buddies
the whole plan is still flawed. even if he manages to save the emperor's life, all he has done is kick the succession down the road. no indication has been made of the empower being immortal so eventually he will still die and Rui will still have to ascend.