[Jack nods, looking down at the ground. He remembers that time, remembers Sulu's refusal to let himself grieve, remembers his unfailing drive to get Ianto back after, no matter the cost] Yeah...

...I think he should know, though. I'm not sure that he realizes...y'know. How much of an effect he has on us. [He isn't quite sure how to express it to Ianto, but. He's starting to think if Ianto might listen, might pay more attention to them, might care for himself more, if... If he knew]