The rest have probably not released the studio version of their songs yet.
I would LOVE to see KATTIE at Eurovision but I'm not sure if she wins the selection. As you said, she has chances with effective staging. I think NAVI and Vladislav will threaten the most.
For example, Anastasiya has a good song and unique voice. Vladislav's song is quite special as well, Angelica's is really generic but I enjoy it and Lexy's is so romantic, I like it. PROvokatsiya are good too, they have great voices. And Nuteki, well, he has to improve on his live vocals and I know you'll say his song is a copy but I like it.