I think that is it too, but it was bizarre for them to group the royal family and Tremaine together when Tremaine had just murdered a member of the royal family. Though, Tremaine is blaming that murder on Ella, so there is that. I imagine the Resistance members would know that it was Tremaine that killed the prince, but Tremaine wants Drizella to marry the second prince and become a member of the royal family, so i imagine that Tremaine will eventually become the power in the land. She just isn’t right now.