According to your own theory, only aurangazeb was the one who forced people for islam. if u consider nizam and nawab as indirect force, then the same is done by christanity as they treats the same with there community.
Islam was never spread by force, if so anyone did then he had done wrong.
According to the latest statistics currently in the world islam is the only religion which is spreading world wide like fire. one single example is the lady journalist which got arrested by taliban, after release she converted to islam, why?, because she has seen the treatment she received by the real muslim
