@Tejas Kshatriya,
I really think that, if you think that you are correct in your assertion, then when did India lose this lead in the sciences, and why.
Countries like Britain , had "Golden Centuries" in which they learned and developed so many things, Yet today, while they arent the leader of the world, they certainly still have a huge output of science discoveries.
It appears to me that most of Indian trained scientists and engineers were trained in the USA, Britain, or Germany. I had so many employees who were originally trained BS or BGe in India in the geological and mining sciences and yet, they came over to the US for their MS's and PhD's