She missed it, and he knows she's not being obtuse on purpose. It's what gets him to be a little extra honest, hoping it's not too much. He's just so glad Jyn has stuck around as long as she has, and he knows Sofia is taken with her just as much as he is.

"Lucky you found your way back. Sofia and I are both in good fortune to have you here."

She shrieks, as if to signify her agreement, even though it's probably just because she heard her name.