Core Issues With 4.x Dark Knight

[Chrono_Rising]

Please tell me if I miss something, but essentially blood weapon's entire function is to compress our 40 seconds of grit siphon strike into 15 seconds of no grit mana and generate blood.

In 40 seconds in grit I can siphon strike 5 times: in grit this equates to a bonus 6000 mana generated over a 40 second interval. We also are moving our GCD .8 GCDs (1.8 but blood weapon also moves us up 1 gcd during this interval) every 40 seconds, meaning that we will being getting an unaccounted for 6th siphon strike every 80 to 120 seconds due to GCD migration.

Blood Weapon: increases my autoattack speed and GCD by 10%, my BIS for dark has me at 2.38 GCD. I expect from blood weapon 480(15/2.7+15/(.9*2.38))= 6028 mana and about 37 blood.

Blood weapon is just returning the mana we would have generated if we stayed in grit for the 40 second cooldown. Though this is an advantage during bursts (remember we line up for every other one) but this means most of the damage gain is actually coming from not having a grit penalty and the blood generated.

In particular this means that we actually gain more mana in grit with the use of blood price than we do out of grit with blood weapon. So switching off grit actually does lower our mana resource pool as compared to our tank stance.