Luka takes a moment of Loading Time to understand what the Wizard is explaining, and even then, he isn't sure he's completely figured it out. If the Wizard is still wondering which parts Luka's questioning - her answer is pretty much all of it!

"Wait... every Princess? How would that work?" He asks, his brow furrowing in confusion. "What about the Princesses who've died?"

The addition clarified things, if only slightly. Four had quite literally removed the Protector from Luka's head - that much was obvious.

"Had it always been a sword? Or did it manifest as one when he made me the weapon?"