I'm just trying to piece together what information we have.
It seems kind of odd.
Most wastelanders know the Brotherhood is a techo-religious band of neo-knightly crusaders collecting still-glowing embers of humanity.
A.K.A. over-glorified hoarders.
Ulysses seems to have known nothing about them. Where has he been?
Also the courier knows nothing about the Mojave Wasteland. I realize it's entirely appropriate for him/her to be completely ignorant of factions so it can be explained to the character at the beginning.
But still, you find no evidence of a home and your supposed boss (Nash) doesn't even know you. All the more reason to point to you living somewhere else.. or the divide. The Hometown Hero achievement doesn't help either.
I also understand it's to "give the courier a blank slate" but that's kind of hard when right at the beginning you're told you knew a guy you know nothing about and supposedly you two have a past.
Going back to Ulysses in OWB, he asks "what makes a nation" whereas Elijah asks "what breaks a nation".
Elijah got the Sierra Madre. Ulysses gets a nuke? Seems reversed.
I don't know, what are your thoughts? There seems to be a symbian circle between making and breaking a tribe, greed and redemption, revenge and forgiveness.
Maybe it's nothing. Maybe the courier ate all the gardetto's and left Ulysses with only rye chips. So he plans to blow up whatever tribe you're associated with.

According to the holo-tape they released, Ulysses does know about the Brotherhood. He just disagrees with everything they stand for.

To me, it seemed like he had to ask Christine about them before he knew their philosophy.
Could be reading into it wrong, though.

He's sampling through every major faction in the West by the sound of it. So far, we know he's worked for the Legion, he's met Christine so he'd know something about the BOS. He's more than likely had close contact of some sort with the NCR so he knows them too. The only one missing from this list is House.

That seems to be the general consensus. But that's what I'm saying. He had no clue about any of these factions until he joined them.
And I use the term joined loosely.

The Courier is obviously new to the Mojave area. He has extensively traveled California (New Reno, among others) doing courier work, and signed up with the Mojave Express, and was supposed to deliver the chip to Primm, where he had never been before, and never made it, hence why Nash doesn't know him.

From what I gathered he wanted to see it from her perspective.

And I do believe the Courier won't be such a blank slate after Lonesome Road, I think he grew up in the Divide and left for one reason or another, spending a while exploring the west (he went to New Reno and Montana) and then signed up for courier job with the Mojave Express.

Sebor, have you ever bought Fallout New Vegas again?

No actually but the DLCs are making me consider buying it again (maybe a few months after my 24/7 400 hour playthrough of Skyrim is over).

The DLCs are just incredible.

I'll be throwing in Skyrim,updateing and unplugging that internet cord.

Well, it is implied that the the Courier is from the Divide and that is where his home is. He knows nothing of the Mojave because he's never been there. Johnson Nash is not his boss he is just the owner of the Primm branch of the delivery company. The Courier hasn't delivered to Primm before.

I think he knew about them (Ulysses i mean) i just think he didn't fully understand them due to their diminished role in the Mojave. As for you. Well who knows that the bullets didn't wipe memories from you seeing as everyone has to comment on your quote "two bullet holes". It seems that the entire situation with Ulysses is based around you, father Elijah, and cristene. I still don't fully see how Joshua Graham comes into the picture which is what I'm trying to do right now...

its not reversed they got their answers respectively. Elijah got the Madre, the physical form of greed and vice what caused the downfall of humanity. Ulysses, he got War, War can build a nation in a day, over night, the so called end of the world in Fallout only lead to a new world one without the conveniences the old world had grown accustomed to. Because war, war never changes...

EDIT: Also, everyone knows the factions of power, no one can say an unbiased opinion unless one has seen it for themselves which is what Ulysses has done. He has gone the extra mile to learn of the 3 main factions of the world. He wanted to know if any of them were worth fighting for. His answer is, none. The Bull, the Bear, and the Brother's are destined to die because of their vices. BoS is the hoarding of the old world kept intact, NCR is the old worlds problematic government, and the bull is the long shadow of history cast out into the world that shows that at its core the world is nothing but a society of slaves of both mind and body and what little regards are freedoms are held to.

I think everyone has pretty much answered the BOS part. I don't find it that unlikely the courier has no or little memory of anything I mean he has been shot in the head (twice?) Good chance the wound could have left memory problems. Also as stated he had never been to Primm before. When talking to NCR people about back home it's never really hinted he does not know the areas it's more like he's asking them what they thought of their respective homes. Also through dialogue he knows and has been to places like New Reno.

(twice?)

the bull is the legion.......

http://fallout.wikia.com/wiki/Caesar%27s_Legion

benny shot him twice in the head.....

What? Someone disagrees with the Brotherhood? Inform the criers, a miracle has occurred!

how come when i read the title i thought that the OP was going to ask if the Courier was already a member of the BoS when the game begins?

"However, the courier was intercepted by Benny, who then shot the Courier in the head twice and left them for dead" http://fallout.wikia.com/wiki/Courier I'm sure in game it's mentioned of being two bullet holes but I'll let someone else clarify that. Even if he was shot once, it's a good chance the wound could screw with his memory just a tad and would be understandable why he'd forget a fair few things.

yeah duh, read what I said about the bull again as you didnt get it at all. I.e I was saying the weakness behind each group doesnt take a genius to know who the bull is.