Originally Posted by R_Hythlodeus
not as long as Loki can keep the illusion that this imprisoned high security person in the dungeon is someone completely different
I was answering a post that didn't deal with Odin being gone whatsoever. He claimed that Loki can just waltz into Asgard, take Odin's form and nothing will seem strange to anyone. Not even Odin.
But to respond to your idea, how did Loki get Odin into a dungeon cell? Is Loki's magic so powerful that Odin can't break it? Is the dungeon cell strong enough to hold Odin?
There is no simple answer to the mystery without getting more information.