Re: "You think you'e the only one who can learn the strength to escape?"
last son, I think Bane's conversation with Bruce after they arrived at the Pit is the biggest support for this theory. He gets a haunted look when he talks about people climbing over one another to stay in the sun. Like the stuff he saw in the Pit lingered with him.
"Never call him that!" Spittle sprayed from Theon's lips. "Ramsay Bolton, not Ramsay Snow, never Snow, never, you have to remember his name, or he will hurt you."
"He is welcome to try. Whatever name he goes by."