Responses
I have another theory that just like Anubis said he'd kill himself maybe something happens to li and he goes back to his timeline or breaksdown again and time gets distorted or some shit so he transfers his memory to mimi who may have died or forgotten li, and he may have transferred Mimi's soul along with his memories into that stone statue. (=・ω・=)

But stone seems to remeber A-Li from the beggining
So it means he has his memories. But he doesnt seem like Mimi in terms of personality. I know im tripping but he is more similar to Anubis than Mimi really. But the plot this far estabilished Mimi to be the ML. I dont think they would change it last moment.
So, waht if stone is a mix of both of them? Anubis is a good but has emotions. Wich seems to be contradicting the function of a god and has powers he doesnt know. What if he and Mimi are the same person, but with 2 bodies? Like Mimi is the human version of the same soul?
Maybe im reaching lol. Im just gonna marinate it and see it to the end.