Swordsmen are too lethal. Garp couldn't stop the sword with his haki
How do you expect him to stop it with his haki when he just went there to save coby with his body
Did you see Garp use haki on his body or arms to block?
This is like saying Lord of the coast is too lethal since Shanks got his arm bit despite his haki
Although we know Shanks didn't use haki there to protect himself