First, if patriarchy within caste is understood as arising from institutionalised endogamy and if it is contingent on the desire to protect private property and the hegemony of the upper-castes, then we also know that there existed no material conditions for Dalit patriarchy to emerge. If you do argue that Dalit patriarchy exists, then what are the material or other conditions that existed among the Dalits (and the Bahujan at large) that gives rise to these kinds of specific patriarchies like Dalit patriarchy? They did not have power, nor land, or property. There were of course some individuals as exceptions who might have had access to property. However, on a larger societal scale, material conditions for emergence of Dalit patriarchy did not exist. More here.