The thing this, if Ulysses was originaly going to take the package surely that would make him courier 6. If your name was below his in the list that wouldn't that make you courier 7?
Ulysses couldn't be courier 5 because the package instructions you get clearly state (i think) 6 of 6, which would suggest the other 5 couriers were already hired.
I am confused? Thinking to much into this? Need to go outside and do something more constructive? possibly.