Why did Muslim rulers of India adopt the caste system?

Caste system has been observed among Muslims in India. The governing group of Sultanates and Mughal Empire, who along with Arabs, caste among Muslims as the equivalent of Hindu untouchables, as did the British and was adopted by outsiders using analogy from Hindu Caste system.

Explanation:

It developed as a result of ethnic segregation between the foreign conquerors (Ashraf) and the local converts (Ajlaf) as well as the continuation of the Indian caste system among local converts. There is general consensus among prominent Islamic scholars regarding a no-discrimination policy based on religious castes.

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