Flow of time

[Alenore]

My impression was that Vanguard was acting as a sort of "airlock" between the two realities, but once we burst it open, the area within the dome became fully part of the Source and subject to an equal flow of time. This is also likely what allows linkpearl communication across the barrier.

I don't see why it's when we went into Vanguard, and not when they obviously opened it to let troops and units go through.
We have no mention of Zoraal Ja having come back to a significantly different time, nor of any time effect between any command center they have (since they're able to relay infos to Zoraal Ja during the second attack) and the units/airships in Tural.