What you fail to understand is how radical an approach it was that MMS took in 1991. The country was deep rooted in a socialistic, red tape driven economy and opening it up for liberalization was a very bold move. It might have been something already tried in Europe but it was almost unthinkable in India. To hell with it, making huge profit from a business was considered something bad (on moral grounds) till few years back.
I agree there are other prominent economists. But its MMS who did something to save the ailing economy not others