It's one of the challenges of writing AUs in this verse. Everything is so tightly wound that pulling one thread out tends to take you on a wild ride, especially if you're trying to pull it back together at the end.
Also do you think the problem with Zathras going back to 2258 would be that there would be two of him outside the time distortion? I don't think that applies to anyone else (Sinclair and his double are inside the distortion). Except for Sheridan in WWE, who seemed to 'go' to the future where he already existed. You can use the 'Sheridan is a Nexus and a Special Case' out, of course. The one time I tried to explain it in a story, I invoked the 'Vorlon ex Machina' clause instead.
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Also do you think the problem with Zathras going back to 2258 would be that there would be two of him outside the time distortion? I don't think that applies to anyone else (Sinclair and his double are inside the distortion).
Except for Sheridan in WWE, who seemed to 'go' to the future where he already existed. You can use the 'Sheridan is a Nexus and a Special Case' out, of course. The one time I tried to explain it in a story, I invoked the 'Vorlon ex Machina' clause instead.