Resistance Trooper compliments both leads very well.
The trick with Holdo/Trooper under Rey is it puts Trooper in a frenzy. Holdo drops Bunker Buster. AoE, probably multiple crits, means multiple exposes, means +100% turn meter for trooper, and AoE daze blocks a lot of the turn meter and counter opportunities that could threaten you. With that setup, Trooper goes into a frenzy, and the rest of your team gets fed a lot of turn meter, too. Holdo is mainly there for the kick start, but I'm told it's a serious kick start. (My information is second hand.)