On the topic of time travel...

There's some potential for very messy ways to make it work.

Such as if we and G'raha Tia go back in time to visit another shard (Such as, say, the First) before it was engulfed by light in order to prevent said engulfing in light, thereby changing the future of the shard and thus our past (Since the Source wouldn't be affected by the First being engulfed, in addition to the WoD's we met no longer having a reason to visit us), then it would mean that we wouldn't have to then go back in time to do this thus creating an alternate timeline.

So there's one timeline where we fail to prevent the destruction of the First where we go back in time to fix it which we can travel between at will and one where we prevented the destruction of the First and thus don't have to time travel, which becomes the new canon timeline when the story progresses forwards.

Basically, allowing the retconning of events, but with a reasonable explanation that we are involved with. Potentially also allowing memories of the events to be kept for those involved, while others would be none the wiser (If those involved ended up taking their places in the "New" timeline)

With of course, the multiple timelines allowing us to freely move between the "Past" and the "Present" with ease, because we're really just shifting between the timelines.

Also, it would be funny to start causing a hassle for the WoD's we met while they're the WoL's and we're the invading WoD's see how they like it! xD

P.S. I spend too much time thinking about time travel...