Kaworu's not especially involved with any of the victims (save for Sai maybe, but only in a negative way) but he's generally a nice, helpful guy so he's going anyway.

So on that note, if any Weapons need a temporary partner he's available! And generally good at resonating with others, and trained with all sorts of weaponry. Alternatively, his Meister ability is Soul Siege, meaning he can create an impenetrable shield with his soul, so if any of the rescuees are a bit too dangerous while all Madness-crazed, he can handle it.