Evidence that the Untended Graves is a possible future. Not only do the ashes appear in the same spot that Yoel dies, but only drops in accordance to actions taken or not taken in the present. Gundyr is an undead and many of us undead have a habit of coming back after being killed. Ludleth talking about the eyes in the past sense is because the eyes discovered belonged to the First Fire Keeper, whom he likely met the last time he was a Lord of Cinder. The eyes themselves seem to have transformed into an artifact that never dies or breaks and can be used by any Fire Keeper. So Ludleth could have also be referring to another Fire Keeper that found and used the eyes to describe the betrayal in detail to Ludleth. The only anomaly is the Shrine Maiden. But simply being there, alive and in good physical and mental health implies that she’s no ordinary undead of whom the concept of time probably has no power over her.