[His eyes turn from one of them to the other as they both speak and line out their findings. The implication of what Gon's saying isn't lost on the professor, either.]

...A shard.... [He repeats, thoughtfully.] ...A shard of his daemonic soul escaping his total destruction.

[He wasn't going to be rash, but... honestly.]

...Gon, that very well sounds like the piece we were missing from this equation. I was suspicious about the close link in age between Yuya and Zarc's defeat, but the timeline didn't match quite right. Something about it didn't seem right, but...

[He sets the book down on the desk, idly opening it to a passage he had bookmarked about the daemon.]

An unborn child would have no ability to resist possession, and would make for a fully capable vessel. ...Damn, I was a fool to not consider that possibility sooner. A daemon of his power...

[Still, before finishing that thought, he stood more upright, his expression gravely serious.]

Additionally... during that little bit with those free roaming memories... I came into contact with a memory I believe was from Zarc himself. [He turns his eyes over to Yuya, where they soften a bit.] ...I believe Gon's theory is correct.

...I no longer doubt that some fragment of Zarc's very soul inhabits your body.