Shanghai Trophy is not a challenger
I've heard it somewhere before, and it's listed on ISU with the same page and everything
http://www.isuresults.com/results/season1920/sht19/
Both Medvyedeva and Tursynbayeva weren't 100% healthy, Trusova and Zagitova were. Jet lag shouldn't be that much of a problem to experienced skaters like Medvyedeva. Competing 'unadapted' to the time difference in her case was more difficult, but she still managed quite well during actual competition. She'd best keep it easy in pre- and post-competition obligations other than training, because then it will hit you. But she's been in these kind of situations before and knows how to handle them.
Yeah Tursynbaeva in particular had to WD Lombardia, i wasn't expecting much and yet still went away with a silver, so that's good: in general she's more a late bloomer.

