A lot of ppl started off with the stacking method, cause it minimizes human error based on individual responsibility. It's a stupid tactic though, as literally all DDs have to move every single time they get targeted by Laser or Gravity Field...which only prolongs the fight unneccesarrily, cause you miss out on possible DPS(unless you run a 4 BRD setup...). If your group members are not retarded they should be able to pass on the rot individually.