Oh man. I cant wait to see next chapter.
About Furuta. I think he didnt reveal his true intentions to Kaneki yet. All we know is they are working toghether now. I doubt Ken know he is spy (if he really is with Clowns), although he may suspect something. Anyway he must have trust in him because I think they went to Eto to devise a plan of rescuing Hinami. Its good because he can bring a book from her with exact instructions for Hinami before she will be killed and it wont be too strange.
I don't think that Kaneki trusts anyone at all really, maybe Hinami only because I don't think he trusts anyone from the CCG nor the Anteiku or now :re. As for that theory in the end, I find it really interesting. He could really do that, Eto and him devise a plan and 'slip' it in a book and then Kaneki can give it to Hinami.