Denjiro is 3 meters tall. King is twice that height.
King is over 3 times taller than Zoro. Zoro is only just barely above King's knees.
Zoro is figure one.
Denjiro is figure 2.
King is figure 3.
Creative liberties need to be taken not to make this the goofiest sword fight ever.
This was an issue with Luffy vs Katakuri as well(as well as the fact that guys like King and Katakuri have designs that animators have a hard time drawing).