#1 Reveal The Fiend's weakness

It's no secret that storylines need to move forward and while the company has done an excellent job of doing this with The Fiend character, they still haven't given any clue as to what his actual weakness is. Furthermore, the company started to tease revealing The Fiend's weakness during his feud with Daniel Bryan, but ultimately gave up on it.
Not only was that a confusing series of events, especially since WWE didn't have The Fiend's signature red light on during his last match with Bryan, it also raised the question as to why the company did this? Of course, it would have made sense if the company continued to tease it or at least gave a hint, but they still haven't done so.
With that being said and there really being no overarching storyline for The Fiend's feud with Goldberg, the company should at least use Super ShowDown to reveal the character's weakness. That way, the storyline moves forward, fans get crucial questions answered and it raises the big question of whether anyone can manage to beat him?