Some people are going to bring this up ''Without Rohit Shetty & Franchise''. Let me tell you one thing, Ajay Devgn is a star and can give a Hit ''Without Rohit Shetty'' providing that the content works. Evidence has shown it in Once Upon a Time Mumbai, Raajneeti, Raid, De De Pyaar De & Tanhaji. SOS worked amongst the masses hence a Hit and he had Drishyam which was critically acclaimed.
The reason why he did not have Hits ''Without Rohit Shetty'' is because of the bad movies he like Himmatwala, Rascals, Action Jackson, Tezz & etc.
As far as Tanhaji goes, Maharashtra has played a huge part in it but Ajay Devgn's mass following has contributed to its success. To carry a big movie on your shoulders requires stardom and mass pull which Ajay Devgn has done. That's why it's performed well in Gujarat & Bihar where Ajay is the second popular actor after Salman Khan in these two regions. He's got followers in some parts Maharashtra like Solapur, Mumbai, Pune & etc.
So providing that content works then it will favor the masses. That's why Tanhaji has performed superbly in the mass belts especially single screens where Ajay Devgn's movies tend to work.
Tanhaji is Ajay Devgn is the biggest grosser beating Golmaal Again's lifetime collections and his second-highest footfall after Ishq. Frankly, I think it would be fair to give Ajay half of the credit for this film being a Blockbuster.