Hip Hop is urban culture that was mostly influenced by blacks, the mess that mainstream hip hop is now can hardly be considered black culture, especially considering record execs have the most influence. Blacks are more popular in mainstream entertainment but there is no real cultural miscegenation.
Define black culture outside of hip pop and then see if the culture middle point theory works.
"We are not stunted in spirit, we are not europeans, we are not Christians that we should invent fables a child would laugh at and harden our eyes to preach them daylight and deep night as truth. We are not Arabs, we are not Muslims to fabricate a desert