Yes this is happening now it's not even that hard just do as your told.
Pure DF que in
1tank on adds drag to front of the big dragon.
1tank on cannon.
1healer right under big dragon so tank can get adds.
1healer on cannon.
All dps on adds burn all then burn big dragon.
Repeat.
Tank and healer on cannons do tether and dragon killer other tank drag adds on aoe for dragon killer ALL DPS AND THE HEALER STACK ON TANK TO KILL ANY ADDS ON THEM.
repeat.
Do all this right big dragon can be dead before it even reaches the gate.
See not hard.