Well, the "ever" comments were all made by Humans.
The Minbari had been in contact with the Vorlons during the time of the previous Shadow War (1000 years before).
Also, it is possible that the Minbari group responsible for the attempt on Kosh's life had gotten help from a representative of the Shadows (someone such as Mr. Morden), although they probably would not have known who their bosses actually were.
Well that does make a little more sense .Since I don't think the vorlons would have made that info public knowledge that florazine would potentially kill one of their people.And I think Sinclair maskes a comment about it in the War Prayer .I always found that scene a little weird even after watching the show a few times that the posion question was never asked again .Unless Iam forgetting something.
Well, you can't say that the alien races didn't work together
SPOILER for the Gathering. Come on, who hasn't seen that yet?
.
.
.
.
.
.
.
Humans, Minbari and Narn working together to assasinate the Vorlon ambassador is a kind of intergalactic cooperation too, right?
Yes I have seen it before

That is the purpose of this forum is to ask a question if you don't know or can't find an answer.