What about his fair that has that special hitbox like a sword, hence it goes right through anything except an attack with that same type of hitbox. It does 17% max, is relatively fast executing, has basically instant recovery on a barrier cancel, and is quite massive, killing at rather low percentages.
If he misses, he can just do his A punch if the opponent tries to retaliate, or shield/roll. I am telling you, Ganondorf is a crazy meat mountain who crushes bones with many attacks doing 15+%, survives to insane damages thanks to his weight, and has ridiculous horizontal recovery (Double Jump, Ganondorf Kick Down B, ANOTHER Double Jump, ARE YOU SERIOUS, Up B).