You're right, there is no indication G'Kar or Londo ever got told about time travel. Though if you want to, you can have either Delenn tell G'Kar post Ship of Tears (since she feels guilty and has promised complete truth and information sharing), or Garibaldi when he's in a maudlin mood about Sinclair and needs to vent.
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Date: 2015-01-22 01:15 pm (UTC)