Real Nation had the potential to become Independent States, and deserved the right of self-determenation.National minorities had no such potentential, and were fated to dissolve, in political terms, through assimilation. Moreover, National forms of political struggle were justifiable for nations, but not for national minorities. One of Stalin's crucial critaria for nationhood was the possession of undivided national territory. They had come to India only after 13th century. Ethnic communities which were fragmented or dispersed were not real nations.They were national minorities. Puerto Ricans living in the United States must be, by this criterian, a national minority. The same judgement must apply to many other communities around the world, including, for instance, West Indies, Africans and Asians in Europe, and koreans in Japan.
So the Muslims in India were not a nation. They were, simply, a national minority and were not elligible to have a state.
There are two Marxist Theories dealing with minorities and there are two different kinds of minoroties, each succumbing to their own distinctive analysis. Puerto Ricans do not fall within the purview of Stalin's Theory, but within another theory which was prefigured in Marx's and Engales'analysis of the Irish community in England and was then developed into a general theory by Lenin in the period of 1915-1923.The fundamental difference between the two theories has to do with the facts of colonialism and Imperialism.