Stardom define opening. And Shahid is just a star not a superstar category due to his movies average opening is between star category. Same thing happen with Ranbir kapoor. Only Sanju openes huge due to many external factors. Before Sanju ranbir is also a star material opening not superstar. So both has not much contribution in superstar category.
Second point is both 2.5 cr footfalls movies comes due to external factors not because of stardom. Open is one of the biggest superstar biopic and second is cult classic south remake.