There's a huge language / culture divide in India and yes managers of a certain culture can hire reports of their culture to be their yes-men but it's not exactly based on caste.
It's effectively a French guy hiring another french guy or a German guy stacking their team with other Germans. It's a bit more complicated than that because if you look at things like power distance index (PDI), India measures way higher in the chart than any western country (i.e., culturally Indians are more accepting of hierarchy than their western counterparts, so an Indian subordinate is more deferential to their boss than an American one for example)
It's effectively a French guy hiring another french guy or a German guy stacking their team with other Germans. It's a bit more complicated than that because if you look at things like power distance index (PDI), India measures way higher in the chart than any western country (i.e., culturally Indians are more accepting of hierarchy than their western counterparts, so an Indian subordinate is more deferential to their boss than an American one for example)