Dear Yankel,
The first step of a Navi is that he comes with the Dvar Hashem and says you should do such or not do such and so on. (According to one poster he has to use the words ‘Ko Amar Hashem’.) It is of no consequence to anybody who the navi did not speak to if he is a prophet or not. So even if The Rebbe predicted the Gulf War with prophetic accuracy, he wouldn’t be a prophet since he did not convey Dvar Hashem.