Well, one could also say that it made no sense that Ninja ended up using Dexterity in the first place when it was a melee class and melee classes all used Strength. They could pull the same move and say Dark Knight uses Intelligence for little more reason than "they felt like it." I would say the main point going against Dark Knight using Intelligence is the fact that Strength, as it stands right now, also affects parry. If they didn't use Strength they would probably want to change the text for Intelligence to state that it affects parry specifically for Dark Knight similar to how they changed the text for Dexterity, but again, it wouldn't be anything they haven't done once already.
