I've heard the idea mentioned to me multiple times. I tried looking around for information on the topic but I can't seem to find any source to back it up. I do know that there were plans to allow the Brotherhood to retake Helios, but I haven't found anything to support the concept that the Brotherhood would be a major faction for the Courier to side with. Does anybody else have proof to back this up?

iv never heard of this, as far as i know they were always planned as a minor role in the game.

At one point you where able to convince Mr house to spare them apart from that i don't think they cut anything else from the Brotherhood

I don't think the Brotherhood was going to have a huge role anyhow. Doesn't make sense that a small club of techno-raiders would somehow overpower a large military force or a powerful group of slavers.

Yeah I don't think there's anything in the game files to suggest cut content for the BoS beyond what others have said about a alliance with Mr. House.

It may have existed in some design document far earlier in the games design, but I don't think there's ever going to be concrete information on stuff like that. Which is a shame, since whenever information gets leaked about a games development I find it to be the most interesting thing. I would read a entire book on the twists and turns of a huge project like New Vegas.

Besides the tunnlers are coming!