nlr has rather good article where the role of khartoum also is mentioned https://newleftreview.org/sidecar/posts/sudans-world-war

Of course, the RSF don’t see the situation this way. The youthful militia members who joyfully film themselves carrying purloined sheet metal from Khartoum to Darfur speak about ‘over-turning the 1956 state’. The Sudanese state, from the outset, was structured by centre-periphery relations that saw the northern riverine cities clustered around the capital exploiting the country’s hinterlands for labour and resources. According to the young fighters availing themselves of the spoils of war, the RSF is simply returning to Darfur what was stolen from it. The rhetoric doesn’t match the actuality. Darfur’s cities, such as Nyala and Zalingei, were also looted by the RSF. The paramilitaries have generalized the predatory political economy of Bashir’s regime. While Bashir exploited the peripheries to enrich the centre, the RSF has turned the entire country into a periphery to be plundered.