Lazada's websites started out three years ago as inventory-based direct retailers--thus,"the Amazon of Southeast Asia" moniker. In the past year, though, the switch to a primarily "marketplace" business model was the most significant driver of revenue growth, accounting for about 70% of Lazada's monthly sales as of November last year.
* Rocket Internet – First Mover In Asia?—Forbes
So back to the "market leader" thing. The prospectus reiterates that many Rocket sites are market leaders but never defines the term. Jabong is pulling impressive user traffic in India—almost 2 million visits per day, as the data above from SimilarWeb show. But that number is nowhere near Flipkart's daily average of 2.45 million.