One Swordmaster... and one Warmaster...
Message:Gurney and Duncan don't do the same things...
Gurney is the swordmaster, responsible for teaching the family the art of the blade and defending their person.
Duncan is the Warmaster, responsible for training the house army... and for leading the fight.
Besides, combining the two from the book into one would piss off far more Dune fans than it would drive off non-Fans...
Yours,
AramisErak
24-Oct-2021