[ It's harder here, with all of them so spread out, but that's exactly what worries him. They need to be watching each other's backs and making sure no one gets left behind. ]

At least if we knew where to look for people we could check on them. It's too easy for someone to disappear and not know if they're hurt or if they're just... gone.

[ He's worried about Kaneki. Even in a best case scenario, he doesn't know what he's going to be going home to. ]

I'd assume it has something to do with the undead lords. I don't think Kaneki got a lot more from the Merchant, but he went through a lot of trouble keeping it safe all this time. I owe it to him to make sure nothing happens to it.