Semantics, but really, more or so because it doesn't make sense. Dual Cast is not a proc. It is not a programmed random occurence. It is guaranteed after any hardcasted spell, thus making it not random whatsoever. In addition to this, all Dual Cast does is make the next GCD spell instant. Cast time has nothing to do with the global cooldown as that restricts the number of actions we can do at a specific time frame.
So if we have a GCD of 2.5 seconds and the cast times are 2.5, we can get two skills within the time frame of 5 seconds. If we have a GCD of 2.5 seconds, and our cast times are 1.5, we are still locked within the global cooldown, thus letting us only cast only two skills because 2.5 GCD per skill equates to 5 seconds. If we have no cast time and our GCD is 2.5 seconds, we still can only cast two spells within 5 seconds.
The only thing cast speed does in relevance to the GCD is that Red Mages damage at a different frequency/rate than any other class because they cast into insta-cast frequently, thus they get two skills within cast time + instant cast animation, but are still locked within the 5 second GCD (using the example numbers from above).



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