Sensai Yu and the Shadow Emissary are huge points for redundancy. Add in Shenlong and you have three models that can push and make fast, but what are you pushing? Shenlong with Yang is fun in combat, but what else is there?
I'd drop Sensai Yu, and look at models like McTavish, Yas, Izamu, Strongarm Suit, Burt Jebsen, Lone Swordsman and Graves. If you are going to muck about with burning, then the obsidian statue seems like a good option but I haven't tried him yet.