So this morning was interesting. People who purchased early access for Super Nintendo World, ran to F&F instead and clogged up the line. That’s why the wait started so slow. They had to accommodate those guests.
I personally would not allow guests who buy early access to just sit at the F&F queue.
I was also informed that technical rehearsals is for testing all scenarios. When the ride actually opens, express will not be an option, and single rider line may or may not be open depending on many factors.