I agree, I don't think he would let Hitogami fool him that fast after getting a stern warning from his future self. I think Rudeus will definitely try to confront Orsted and decide what to do after hearing him out, or they'll outright plan to assassinate Hitogami together, since Hitogami can't see stuff related to Orsted in his visions. That way Rudy can pretend to go along the Hitogami's plan, not antagonize him at the same time, and meet Orsted, which is a sensible thing to do in Rudy's current position anyway