Technically none of the National Team members need to compete here either, so most of them look to be doing it to get a competition in before Nationals since the ones competing here weren't assigned to NHK/Zagreb, and aren't likely GPF qualifiers. There are teams competing here who just competed at Espoo this past weekend, like Bashynska/Beaumont and McIntosh/Mimar. For Schizas, she may be feeling fine with how she did since she had a better showing on the Grand Prix than the other Canadian singles skaters.Not surprising that Schizas is not attending given that she just competed at Cup of China. I am surprised that Daleman is not on the list; I guess she has a bye to Nationals?
For Gabrielle Daleman, I don't think she would have qualified for a bye to Nationals. She wasn't assigned to a Grand Prix event and didn't compete at Nationals last season, so wouldn't have been a medalist there. Those are the two main ways to get a bye to Nationals. I don't know if she'd get a medical bye since she last competed in August and scored around ~144 total I think? I don't think that would be enough to justify a bye to Nationals, although it looked like she was given a bye to Challenge by Skate Ontario at sectionals.

