User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140110163738/@comment-1359322-20140110165329

Actually i think that's cause Kiba placed some sort of limiter on Gram or he didn't use Gram to it's full power yet. Gram is a sword that is supposed to be equal with the Caliburn after all.