well she never summoned him as a hero, she just reincarnated him to cover her own ass, so i dont think she has any grand designs i think shes just kinda stupidYou're assuming the goddess is a benevolent one. It's entirely possible she's a bored, petulant child who's summoning reincarnators on opposite sides to use them in a chess match for her entertainment. And is just really good at appearing benevolent.