and going through all Joshua's dialogue options, he said that (I) the courier was not the one he expected, as THAT courier is one of Ceasar"s assassins.
this puts an interesting spin on what may come up in LR.

Something similar has been said in the Vault's wiki about Joshua's dilogue and it has already been speculated that Ulysses is working for the Legion :happy:

http://fallout.wikia.com/wiki/Ulysses
http://fallout.wikia.com/wiki/Joshua_Graham

but there could also be other couriers. Ulysses most likely used to work for Legion but does not mean he does or did. It could be a different courier they are talking about (we get no notice of things to come after all). We currently have 4 unaccounted for couriers.