Kou needed more training in the ways of the force, just kidding, but the title of the episode is kinda on the nose don't you think. The Death Star exploded not from a lucky shot but because the Kyber crystal powering it was removed, which doesn't my sense if there is not power to power it, it shouldn't be overloaded by power. That's like removing batteries out of a remote and pressing the power button triggering an explosion.