Aadhaar is NOT a proof of citizenship. Like PAN, Aadhaar can be issued to any foreigner who resides legally in India for over 180 days.
Indian citizenship laws are messed up.
(1/2)
All documents are auxiliary so long as they prove this date of birth (of the applicant or their parents) depending on the year.
(2/2)
This is why NRC is dangerous. For the 1st time, it puts the onus of proving citizenship on people with no clear laws.