No problem man. But Sultan had the benefit of commercial content while Dangal had a more non-commercial feel to its promos. No dance sequences which masses love. Which was the last movie which did ~30 crore opening with no in-story song-dance sequences? None.
Dangal was highly affected in single screens due to demonetization. Multiplex people have no problem using online booking or credit cards to buy tickets, but single screen people are not very familiar with this technology, and they don't want to spend cash during this demonetization time. Sultan had no such cash problem.
Nonetheless, Sultan was a huge success, 300 cr is not a joke. Only 3 films have done it so far.