BAM! New haircut!
The fact Saiko is sleeping is meaningful because the phrase associated with her is "she will sleep again". It just proves she hasn't done almost to none progress in her character arc since in such an important battle she is absent exactly like in the beginning of :re. All the other Quinx are still stuck on their phrases as well. Mutsuki is lying, Urie doesn't talk and Shirazu is even after death made out to be the one who would solve all the problems by Urie.