Wasn't the main fleet in some other star system dealing with something never explained, which is why Enterprise and the other vessels were crewed by cadets?I don't think Trek has ever been scientifically possible. I've lived to learn with that. What I still can't live with is when one of the shows puts someone in command that shouldn't be remotely near the captain's chair. Crusher, Chekov (in ST2009), Kirk (cadet promoted to first officer), Tilly.
Them getting to keep their positions afterwards is a bit much, but hey it's a movie. YMMV.
