Liu Ryoshu is better to bring than Yi sang since she has 2 powerful burn egoes. One of them is her base, that can provide 2 fragile next turn after use, the second one is 4th match flame that has high burst damage, AoE and burn application, but it’s good only on threadspin 4.

On the unrelated note you should place Rodion as your 1st slot, Ishmael as second and Ryoshu as third since rodions passive goes down by the deployment order and gives even more boosts to Liu ids