Guiltythree
I am wanting to bet that imp might have been a DORMANT TITAN or something super strong but not awakened yet. This would explain the powerful presence of the gate with lackluster monsters. It would also explain why the creature was super intelligent and chose to run when it saw Sunny. So basically, because it got away and it’s capable of rapid growth, they’re screwed in the future ;).
I jus thought about it that thing that escaped grow stronger by eating other nightmares creatures and in Antarctica there will probably be millions of nightmares corpses witch mean that thing is gonna become insanely strong. And that thing will have a grudge against sunny. So because of this single mistake the scientific might die ,they will face an absolute monster witch may cause the failure of the evacuation and the death of a lot of important characters. No wonder future sunny had so much disdain for it’s past self (just my thought)