Gustang lost his sense of dignity. Proust being jobber is expected but not when towerborn can just come to your house and your whole family.
Even if he saved them somehow it's pathetic to just run away from someone you calling a vermin.
And Traumerei was watching right at sprout where v came from. Urek while surrounded by FH attacks noticed while neither gus and troy didn't. Traum didn't even flinch at his when he was near
I mean it's not like you can't fit all this in one arc. He is already a FH level, at this point any fight below FH tier is boring and meaningless. And there is not much enemies left to fight with.