Quote Originally Posted by MikkoAkure View Post
After spending some time to think about it, I don't think there's a plot hole because that involved one-way time travel. G'raha's journey also changed the timeline so much that he would be completely unable to return to that branch even if he wanted to.
This is likely the case. If you notice the time loops we've had, they've always required the target going back in time and then returning to their normal destination. G'raha's journey however, was a one way trip not only through time, but also space, breaking the normal rules of time travel we've had.