Easter egg: On the 2nd disc go to storyboards. Go to the 2nd page and select rhino fight under Deleted Sequences. Press up once to select the rhino and press enter. This will get you to a section called What Happened to the Rhino.
Easter egg: On the 2nd disc select trailers and TV spots. When you are in this press left once, this will highlight the bird on his chestplate. Press enter and you will get a funny Chicken Run trailer.
Chosen answer: Because they would be the ranking soldiers, and accustomed to being given orders. Being disciplined, they would obey Quintus without question. The legions would necessarily have soldiers assigned to following orders at different times, similar to how a captain would give an order to a full room, and the first mate would be the one to carry out the order.
rswarrior