[quote=GuyYouWishYouDidntKnow]
You're not getting it. The resonance is his rump card. Fragarach was used as a response to the Resonance. Powering up can be a trump card, as with what BB said regarding God Hand. When Fragarach was fired, it was done as an attack with regard to the Resonance.
[/quote]

Okay, so imagine if Stein had missed with his attack. Gilgamesh would have fled or something (hypothetical situation). Years later, he would have thrown the dagger. Would the dagger turn back time all the way to the event of the trump card attack being used?