Since there are a billion plus Indians, the statistics say that you are bound to get a few very smart people from among them.
For excellence in sports, particularly at the olympic level, you need training facilities, budgets and infrastructure in the country. You will find that India is sorely looking in these!
I do not see what the ethnicity of these people has to do with their success. I think more credit should be due to the organisations who hired and supported them up the career ladder.
Although statistically, Indians should have a few smart people anyways, the number of CEOs the nation exports is disproportionately high in comparison to other countries.
Also, how is population related to this ? Europe also has a population of about 850 million - how many CEOs has Europe produced ? I mention Europe because it's the closest in comparison to India in terms of population diversity.