Originally Posted by
Sapphidia
A full fell cleave combo doesnt take 9 GCDs, it sometimes takes 8 due to instant casts. You also can ONLY calculate dps via average potency per GCD because fights last variable amounts of time. Fracture doesnt make you -lose- a Fell cleave, it just pushes it back one GCD.
Thus, lets say you do two rotations for 18 GCDs without fracture. If you were to put a fracture in there it would become a 19 GCD rotation. You'd still have the same amount of fell cleaves, it would just take longer. To work out whether it was a DPS increase, you'd have to see if the total potency of the 18 gcds / 18 was better or worse than (total potency + fracture potency) / 19.