I feel like the slight jarringness of the show sticking to the original plan with Londo, the Keeper, and having him vanish from everyone else's life for 15 years was a side effect of this, because having him get as close to everyone in season five as he does, and then disappear, very much had that feeling (to me) of rerouting the plot onto its original track when it was starting to go down a different, more organic track that I've experienced with other shows. (White Collar, I'm looking at you.)

Yes I felt this way too, especially the first time I watched S5 long ago -- it felt like it rerouted back from where it was and I went bwuh??

Kind of curious if Garibaldi/Lise was a thing in the original plan now, kek.