I have so many questions about this, but I think it basically boils down to one thing. After the war, the relationships between most of them had been repaired to some extent. So why didn't Londo tell Sheridan, Ivanova and Delenn about the Shadows and what he'd done with them?
And why didn't Delenn say more about the Drakh? I think she told Sheridan about them, and he questioned both Londo and G'Kar. So when Londo was confronted by the Drakh, why didn't he ask the others for help?
It honestly feels like, at a certain point, the writers were deliberately pushing the characters down a particular path to make certain points, especially when it came to Londo. Because, at least to me, he seemed to have reached a point where he could genuinely transform himself, and I think he did a lot to redeem himself.
Yet, despite everything Londo did for G'Kar, including saving his life and helping free his people, G'Kar still seemed to hold on to his hatred of him. And then, when the Drakh started manipulating events to make it look like the Centauri were behind terrorist attacks, everyone seemed to turn against Londo and the Centauri, despite how far they'd come from their old ways.
I don't know, but from a certain point onwards, I just couldn't make everything fit together logically, especially when it came to Londo, the Drakh and the others. I still feel like I'm having to fill in the gaps myself, and the only explanation I can come up with is that the writers needed things to happen that way to get across the points they wanted to make.
Because I genuinely don't understand how the Drakh managed to get so far without anyone doing anything about it. Not Sheridan, not Delenn, not even G'Kar. For example, G'Kar was actually at the Royal Court, and he knew from what Londo had told him, as well as from what he'd witnessed himself, that something wasn't right. He even mentioned to Sheridan that strange things were happening at the Royal Court involving Londo.
And let's not forget that Londo himself spoke to Sheridan and Delenn before becoming Emperor, asking them to always remember him as a friend.
I just can't make sense of it. Every time I think about it, I end up feeling like this is the one really stupid thing about the show. And whenever I've tried to explain it to myself, I've come back to the same conclusion: the writers needed things to unfold this way to make the points they wanted to make.
But even so, I still think it's poorly written in places, and that you're basically expected to look the other way and pretend these inconsistencies aren't there.