I have to say, several of those questions were pretty loaded.
Sechel: for #4, you think he should be considered the leader of the generation for everyone, including those who don’t hold of Chabad? I.e. the belief would be that the Lubavitcher Rebbe is actually everyone’s Rebbe, not just Chabad, and Lubavitchers are just the only ones who acknowledge it. If that is the shittah, then I must say that’s hardly any more acceptable than meshichism.
Or, do you just mean that you, speaking from the point of view of a Lubavitcher, would consider him the gadol hador in the same way that a Sphard would say so about HaRav Ovadia Yosef or a Litvak about Rav Shach? If that’s the case, then that’s obviously normal and I don’t see why anyone would consider it controversial.