Phillip hums, an acknowledgement that yes, that is probably very strange; it was certainly strange (and heart breaking) from his end when the world was first sundered, seeing thousands of small, stunted souls that may contain his lost loved ones, no longer able to remember him.

"I... suppose it's possible." If he sounds doubtful it's because it had been a long, long time since anyone had been able to stir the kind of desire and love from him that Gustavain has. The last was, well... Azem. (A point he's sure to have to bring up eventually, but it's easy enough to blame the fact that now seems like a horrible time for his desire to not talk about it.)

But maybe that doesn't eliminate the possibility- even when Gustavain had been born, there had been six Rejoinings already. Did it take half of that soul to pull him in? Was it worse to picture that this was their first reunion in thousands of years, or that it wasn't and Phillip hadn't know? Because if they had met, knowing Gustavain and the soul he has, it would like have been on the battlefield, and likely not as allies.

He does not voice these thoughts, instead just tipping his head towards Gustavain's and reaching up to run a hand through his hair. "...I wish I had some kind of answer for you," he said softly. They don't know, and likely never well. And the wondering can be much worse than the knowing.