Kitru, while I overall am agreeing with your assessment of IB oGCD increasing damage, you really are only looking at it from a theoretical mathematical standpoint, instead of a practical one. Yes it will theoretically increase DPS of Warrior, it doesn't even take math to realize that. In realistic/practical use, it'll probably be less then a fractures use however. If a Warriors is OTing, they should be dropping Defiance to increase DPS, which makes IB oGCD moot. If they are MTing, they should be using for spike damage as its designed, which having it oGCD will effectively do nothing but quality of life while we continue our normal rotations instead of sitting on our thumbs.

The only time a Warrior is going to be in the position to Spam IB is fights like Ifrit EX where you are constantly switching between MT and OT. In these situations, its still better for the Warrior not to spam IB, and at best they'll get one off before needing Infuriate up for an actual mitigation on Ifrit mechanics. Same can be said for fights like ADS, etc. Not to mention the chance of a spike crit hit of IB on tank swap, mixed in with GCD abilities would most likely rip threat off MT easily.

I really wonder how much DPS increase a Warrior would see if literally spamming every available IB with oGCD, and how it'd compare to a Warrior dropping defiance as needed instead, and IBing only during Spikes. I'm certainly leaning toward unnoticeable, but I'm not a number wizard like you Kitru.