What is unsaid is that China also expect it's client states to support it other objectives such as the expansion in the South China Sea and other geo-political objectives in the the UN and other bodies. While China will have no problem using Pakistan to it's own ends, I also firmly believe that Pakistan will eventually back stab China, like it did to the West. There are to many power factions in Pakistan working at cross purposes and Pakistan being a Islamic State will eventually see China's influence as a threat to that status and how China handles it's own domestic Muslim Issues will also influence what happens to it's people and project in Islamic countries. Can't say I will shed a tear as the two of them screw each other.