-ISL was launched 10 years ago. As India's premier football division. The quality difference between isl and the I-league ( what used to be the premier division 10 years ago) is substantial.
- No, there are not 2 top divisions, ISL is top, only isl gives spot for the AFC champions league ( the league winner gets it, called the 'Shield')
- After league top 6 fight to win the ISL 'Cup'.
-Since last year there has been rule of promotion(yes only promotion for now) that the I-league league winner will get promoted to the ISL.
- This will go on next year as increasing the total teams in ISL to 12+1=13. After that they'll consider what to do (i.e. If to implement relegation....)
-So no Wierd Extra things, just slightly unique, which is completely acceptable for a country where football is budding as a sport.