You know, technically the Rajas of Satara (the erstwhile Chhatrapati, technical heads of state for the Maratha Empire or Confederacy) were also Mughal vassals, as the release agreement of Shahuji (from Mughal 'imprisonment'), the later Shahu I, stipulated that he had to swear vassalage to the Mughal throne as a condition of his release from Azam Shah's custody (the immediate successor of Aurangzeb as Muhammad Azam Shah). That is the reason why Maratha Chhatrapatis never really disputed Mughal claims to be sovereigns of all India, nor claimed equality with the Emperor in Delhi, despite their title of 'Chhatrapati' which equates to Emperor.
So even they, are strong candidates for the theoretical Indian Imperial crown, if your logic is to be followed.