I sincerely doubt it's Gideon telling his former self what's going to happen. JMS has detested time travel, and has used it sparingly at best, the obvious case being WWE. It just creates too many paradoxes, and complicates matters, not to mention you have to make sure the future is consistent with the past and vice versa.
It's just a lot of trouble, and it's more of a trekky solution, something the Great Maker wants to avoid.
Sheridan: Are you trying to cheer me up?
Ivanova: No sir, wouldn't dream of it.
Sheridan: Good, I hate being cheered up. It's depressing.
Ivanova: So in that case we're all going to die horrible, painful, lingering deaths.
Sheridan: Thank you, I feel so much better now.