I don't know if it's actually going to be one of Gon's weaknesses since it's more like a shounen trope, but it can't be denied his special attack is far too transparent. Even if he can "surprise" more idiotic opponents by cutting it short and using scissors instead. But nevertheless the beginning alone is too obvious and undynamic. Kite's technique also required the opponent to grant him a moment to summon a random weapon in a goofy manner, but I don't think most of the badasses had any such weaknesses.