I do think those are some reasons. I remember back in S7 with Emily: one of the things brought up about her was she was "really pretty." She was only on DCC for one season, maybe by choice, maybe by suggestion, but she had trouble the entire TC for not getting DCC style.
I just know there's some reason they released Madeline, Shaina (and others) from TC but kept Kat, Meredith and Lily whom DCC:MTT are showcasing as weak. (And yes, we know there's a drama element to the hyping of the underdogs too.) I just wish they'd show us as the viewers more of what the reasons and reasoning were for keeping them were.