So basically I had this theory that Thranduil wasn’t showing Thorin EVERYTHING. He only unglamored a piece of his face for a moment, we don’t know how far the scarring went. And considering he was definitely blind in his left eye from that scarring, the headcanons…grew.
“My name is Lemony Snicket and it is my duty to tell you their tale. No one knows the precise cause of the Baudelaire fire, but just like that, the Baudelaire children became the Baudelaire orphans.” -A Series of Unfortunate Events (2004)