Responses
Guy said to Diablo that he will visit him later, right? I believe that's the moment he even learn that those 4 are primals.
yes but we wont see that until the time loop arc is finished:'D
beta
so diablo has recruited primals for rimuru but he doesn't know they are primals. he believes them to be really strong demons that's it and diablo doesn't seem to have told him that he and other demons are primals, so like when does rimuru find out in LN that all demons working for his nation are primals?