Sujoy was a big deal because he was ranked world #1 in the early days of Quakeworld, was a feared dueller, and played for one of the top UK clans of the time, Demonic Core. I've still got a copy of PC Zone from early 1998 where there's a big article on how he spent his time at Cambridge uni
I think he handled things well from a publicity point of view, when Quake3 came out he quit his job as a banker in the US to become a 'progamer' and appeared on TV shows like big breakfast etc. When it became apparent he wasn't going to dominate in Quake3, he used his reputation to aid business ventures like
www.esreality.com (formerly xsreality). This is uncannily similar to what Thresh did; he basically used his name to setup "Thresh's Firing Squad" as it was known at the time, which is now a very popular gaming/hardware site. Xfire is another well known gaming brand which he had a hand in.
Another factor I think which we do need to bear in mind, however, is that both Thresh and Sujoy had very, very good connections for the time. Back then most players were on dialup connections, meanwhile those guys were slpbs pinging sub-20 which gave them a huge advantage online. Whereas Fatality, on the other hand, has been doing the business under much fairer LAN conditions. There's no doubt Thresh was a great player (especially in Q2), but I think he was also quite canny in terms of choosing his opponents, servers etc, basically trying to maintain his 'invincible' rep.