IIRC correctly the war with Earth was originally supposed to carry on into early season 5. They rushed it as they thought at first that they were going to be canned after season 4. In the end they got picked up by another network but it was quite obvious that, aside from the fall of Centauri Prime and Londo's arc, they had largely shot their wad in order to avoid being cancelled without a resolution. Sleeping in Light was shot in season 4 and then pushed back to the end of 5 for the same reason.
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