Aether is suffering a repeated early puller, too. The Aether DC community at large shows a profound resiliance and sticks to the "tag and step back" method. It's disheartening to witness the mark dead while many are en-route. "Hug the Aetheryte" tactic, cross-world linkshells, and a web companion aids are not helpful enough to reach the mark on many occasions.

OP's proposal: The Spawner's Perogative

A veil, or some sort of limited buff giving the perogative to spawner would be a solution to the immediate problem. Of course it would expire within a fixed amount of time to prevent a lost opportunity for all. This solution would curb anti-social behavior in a normally collaborative endeavor. Hunts are one of the few casual endgame activities and shouldn't be competitive. OP's proposal would also solve the fast kills on Forgiven Rebellion, where spawners are forced to spread across the map, and often the furthest participants miss the kill. The developers have been so careful to avoid competing loot streams in most activities; yet, these S-Ranks are a limited resource. Equally, anyone can purchase a level-boost and solo lower-level S-Rank marks without skill or time invested. The barrier of entry is low for this anti-social behavior, intentional or unitnentional.

Another problem needing addressed involves mismatched levels in hunts. I have met a few players who have their early MSQ progress impeded by A-Ranks blocking quest NPCs.