I like Samantha but she does have a tendency to UR her jumps; same with Polina---that could hurt both of them at Nationals. Just because Mirai didn't get a string of URs at CoR doesn't mean her UR problem is a thing of the past. That particular caller was pretty lenient with URs; Miyahara and Murakami usually get many more than they did there.
Gracie doesn't UR and last year she showed her Nationals grit. I can't imagine Gracie NOT making top 3.
I don't think Edmunds has UR problem like Samantha and Mirai. She got 61 and 62 TES for her long this year. That was very good for juniors. You can add another 3 point for spiral seq.