All-Star Stunt Formation/Evaluations

[New2CheerMom]

Hi All! Looking for coaches feedback and veteran cheer moms. As most are or will be going through tryouts soon, what are coaches looking for when testing stunt groups? Is it only if the stunts hit? I know I have very limited insight into what coaches are thinking but curious to see what goes into it. We have two weeks of stunt groups and there are switching people in and out of flying and basing. My oldest hasn't switched out as base and my youngest is switching from base as the beginning to flyer. She has previously based and flown. It seems like they have a large amount of flyers but wouldn't they already know who they want to fly when they created the teams? Thank you!