Well a rapier is actually heavier than a long sword and would be historically incorrect if finesse was needed to use it. I also would like to once again state that custom characters could use optional origin stories; I personally like to imagine that a Custom Lizard would unknowingly be part of the House of Shadows and could replace a dead Shadow prince as its leader after proving themselves by collecting some artifact (a special cowl e.g.) hidden in Horrorsleep. How they lead in the epilogue is obviously determined by decisions made during their own quest and those of Sebille and/or the Red Prince.
Don't know if that tangent is allowed, but one mistake won't deter me.