It's not about using less Druze as possible, with only 2 and Gromoz or Arslan you are sometimes hard pressed to reform the core team. Druze are the elite badasses that run the show, like HI in another faction. Instead of multiple wounds they get tons of kit and skills to bail themselves out of nearly any range band or the Retreat! state. Most lists I write tend to have 3 Druze and Gromoz and/or Arslan. While that seemed low to me in the "Druze" sectorial, I don't know of any sectorial that is solely based around one troop. More than anything, even their cost, the 4-2 MOV score is what holds the Druze back from being viable at every role. They can't reposition efficiently and it limits their ability to score or push across field. That's why the other units like Hunz, Peacemaker and the Angry Ninja are necessary. Fortunately as a whole the sectorial is well designed, even if the Druze themselves have roles they cannot fulfil easily.