how? all points are invalid.
tobi said he needed sasuke to sync with the gezo mado (which doesn't seem to be a problem after all, thanks kishi)
he said he would give sasuke over to kabuto AFTER the war
As for letting Sasuke live, I doubt that mattered to him at all. He wasn't even around when Itachi killed his parents.
Not even gonna argue the 2nd paragraph because of time travelling paradoxes, but Itachi is the one that confronted Tobi