He is not in IT, if he was then his tobidara would have been shown long ago and all people on the base would agrea with his theory the first time he told it, he would be treated as a god on the base.
instead IT doesn't exsist, he is in the real world where only 2 chapters are remaining in the manga, no tobidara will be revealed in a manga that will leave some questions unanswerd (first hokake's jutsu passed on the sasuke, the sage's tools in tenten's hands ....) and so he will still not give up on his tobidara and make himself more of a fool on the base then he already has. all by his own hand.
seriously dude, for your own health, you are going to have to let go of your theory or it will consume you even more then it has now. I have no problem with you wanting to believe to the end, but I realy hope that you will be able to accept it if it doens't happen.