Spoilers
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Andrew: Is everything a Vorlon conspiracy with you?
Yes. To a first approximation. The second approximation brings in the Shadow conspiracies and things just did not work today.
The third approximation is bye bye Shadows and Vorlons; Sheridan is the boss now.
Going back to the opening lines of Babylon 5 The Gathering -
"I was there, at the dawn of the Third Age of Mankind."
Basic arc for millions of years the "Second" Ones have fought the Shadows and have now achieved First One status. A million years ago work started on raising the Third Ones to First One status. The Vorlons and Shadows were chosen for this task.
The Vorlons have come up with a Master Plan. A plan that will last thousands of years. It will involve the creation of jump gates all over the galaxy, converting animals into sentient beings, making the sentients telepathic and in the final stages the creation of the Babylon stations under the control of the key race the humans.
Third Ones task - "Z'ha'dum" and Sheridan's briefing when he gets back to Babylon 5.
Jump gates - "Into the Fire" and the background information in the card game.
Animals into Sentients - magazine story "Nautilus Coil".
Sentients telepathic - "Secrets of the Soul".
Humans the key - "In the Beginning".
Vorlons plan Babylon 4 and 5 - this is the missing bit. The Vorlons turn up at the end of "War Without End - Part 2". Kosh arrives in "The Gathering" having helped pay for Babylon 5, Kosh tells Morden and his Shadows that Babylon 5 is not for them in "Signs and Portents". The Vorlons provide technology for the Whitestars in book #9 "To Dream in the City of Sorrows".
This all adds up to a very big conspiracy and like all big conspiracies it fall apart in the end.