Lets see now, XSL got the support of Chu (with the Empress and Li Yuan), Dian and all the minor warlords in Southwest, Wei (with the Prince he released and Lord Longyang) and Han (with Han Chuang). He could get Zhao's support if he really tried, with the Empress there that likes him. He is partners with Yan. So he only has Qi against him who is without Tian Dan. I gotta say, he should just become King himself. haha
Of course he won't, but with these support plus the Qin military and the Crown Prince, I don't think LBW should be that tough to deal with.