Man, does any one remember what happened to Yamato about 17 chapters back?
He got abducted by Kabato, but we've never heard anything of him since. How odd. Maybe Kishi just forgot about him.
That is because he can't be of any use while he is still abducted and not every one knows about his abduction. If he did refer to Yamato again, it wouldn't surprise me if it was just one page he was one.