Some more AU things I've managed to remember about this timeline so far:
-As well as Zhang Bao advancing through You and then into Bing via a brief alliance with the Black Mountain Bandits and marching through the lands of the northern nomads (and stealing their sheep!) the Yellow Turbans have had other butterflies occur
-In You Liu Yu was murdered by Yellow Turbans, turning much of the population of the province against them, despite their successful occupation of large chunks of it
-Gongsun Zhan and Yue and his White Riders have marched to the north of You and started recruiting the border tribes there like the Wuhuan and Xianbei who admired Yu to fight against the Turbans
-Liu Yu's family was saved by a group of his retainers led by Xianyu Fu, his son, Liu He is planning to avenge his father by aligning himself with local militia
-The General of the Skies, the leader of the Rebellion, Zhang Jue, has captured the Commandary of Julu in Ji province and all its cities.
-The General of the People, Zhang Liang, is training armies and militia across Ji, which has largely fell into the control of the Turbans outside of some urban and fortified areas
-Nanyang in Jin Province has also fell to the rebels, which means that, with if Shu hadn't won here the Captial would've been surrounded on three sides. And it still might if the Turbans capture Taiyuan and march south.