CJI: theme is the same, the sub classification which is permitted in Indira Sahwney for OBC is not permitted in SC/ST , because they say its one homogenous class and once parliament has designated a class, you cannot sub divide, sub classify . And your contention is that parliament's power to designate is very different from the state's power to implement reservations under 16(4). ....article 341 is all about identification/ inclusion/exclusion of caste