...in a commercial sense.
If you look (objectively) at the success of the top 4 contestants from II 1 or SRGMP challenge (top 3) it becomes self evident that they have done far better and have become far more sought after than FJ.
Abhijit, Rahul, Prajakta (the exception being Amit Sana who just doesn't have a very good stage presence) have gone to UK, Africa, Middle East (among others) for concerts. Infact, Abhijit will be performing around the world with Vinit and Hemani in UK, US and middle east.
Now compare this to FJ. They have had a few concerts in Bangladesh and perhaps in the middle east and Africa. They are not sought after and there is no "buzz" about them. I don't anticipate anybody would sponsor them for a concert tour in the west (where the big money is).
Additionally, all these other contestants have sung for hindi movies (yes, each and everyone of them). To the best of my knowledge (and I'm not 100% sure about this) neither RR or Qazi have been offered songs for Hindi films.
Based on all this data, one can deduce that FJ was and will remain far less successful than the winners of other like contests.