And even if it wasn't guarded, with no fighters to protect him after the DCS was destroyed he still could not escape.
There were only two important battles- the ground battle, which distracted the TF army so the Naboo pilots could get to their ships, and the space battle that finished the Federation's invasion.
The sabre battle was important in its OWN way, but not vital to the battle and so could have been conducted seperately.
Amidala's kidnap attack is certainly the most expendable.
The reason whe they were at the hangar was because they went to capture the Viceroy and the rest went into the space battle. There weren't any just hanging out, not to mention they would have been killed had they just waited around.
To compare them to soldiers:
They were basicly like mall security guards compared to Green Beret's