ROTK 8 Remake Cao Cao's revenge Tale

Just doing a created officer run in northern China while trying to follow the historical tales to get Liu Bei to end up in Yi but I'm stuck on this one as It wants him to still be in possession of Xiaopei and Xiapi. How could he be in possession of them if by following previous tales Lui Bei loses both cities to Lu Bu and ends up running to Cao Cao and Qiao and then joins the plot to assassinate him? It doesnt make sense how this could be possible. Am i missing something?