My sister renewed her passport (with the expedited fee) and got it back in 7 days!! I applied for mine, never had one, and it took 10 days (with the expedited fee) but we are very HAPPY with the quick service! Going to Mexico Jan 22nd.
Good Luck "trulyamazingtoo" - I hope your co-coordinator is right about not needing one! I have heard it's not a good risk to take as you could get stuck in Mexico.