Ah man, always gotta ruin the fun Miyu. But wait, didn't the Dynamo already launch its nuclear reactor at Grafdakka when he tried to assimilate them? Be pretty weird for the Dynamo to be running on two of them, even if one is a spare. 

I do have one more trump card to deal with this turn of events, which might at least preserve Shizuka and Miyu. As for the others in not too certain...