De acordo com o JMS , ele foi retirado por "forças opostas à própria noção do Projeto Babilônia". "não pelas Sombras:
Why didn't the Shadows destroy B5 before it went online?
B5 wasn't destroyed because it wasn't the one that would be taken back. Yes, the prior stations would've looked more like B4 but they were sabotaged very early in the construction process. You'll learn why he didn't want Garibaldi along next ep. (src)
The B1-B3 sabotages had nothing at all to do with the B4 situation; it was just done by forces opposed to the very notion of the Babylon Project. (src)
The first 3 Babylon stations never got much past the very earliest stages of construction, just some hull elements, that sort of thing, nothing that could be recognized. Other forces took them out, mainly for political reasons. (src)
B4 survived the prior shadow war, but in very bad shape; didn't last much longer after that.
Did the Minbari agree to help fund B5 because they knew about B4?
No, because if you remember, even Delenn didn't know where B4 came from until she came to B5, well after completion.
A resposta de gbjbaanb para O que impediu as Sombras de atacar a Babilônia 5? citou um desses pontos, o que me leva a encontrar o resto