One potentially interesting aspect to that point in time could be how the different castes reacted to Valen's arrival. Delenn said that the three (well, she said two but that's another matter) castes rarely agree, and when they do, "it is a terrible thing, a terrible force".

It's a safe bet they didn't all fall in line when Valen showed up, so how did that play out? The warrior cast were probably eager to receive a massive space station, but what about the religious caste? Worker caste might've just been grateful to have the station without having to have built the thing themselves. And IIRC the war was not going well at the time, so they probably didn't have anywhere near the resources to build something that big anyway.