Thank you.
I do agree with the time travel and author's intentions, as I've been stumped a few times when reading stories with this element. Zirsi will be pointing out soon, that "Magic is powerful, but even it has it has limits. We can send non-living simple items back in time, at a steep cost. We can scry the past, and see events on how they unfold. Even Psychics can do that. But, even with our Technological, and Magical Knowledge, the Thorian Empire, and our allies, have never been able to send back in time a living person or a sophisticated machine. Something is blocking it, and we do not know who or what that is."
So, the future four had a 'one shot' of sending something back. If they acted in the past on the information given, it locked one timeline, from interfering with the new timeline. Zirsi did that when he went to Gilese and shared the information with the Humans.