[Even with the strongest and most unshakeable front, nothing is ever absolute. It's good to have people to keep oneself grounded. Shino may not be the one most would first think to turn to-- but he tries to be there to support his friends, just as he knows they would do for him when he's not forgotten anyway.]

If they have, they have no recollection of it. [He... already mentioned that people can return with memories of what they have experienced. He won't repeat it. If they were abducted, it would mean altering their memory. And then there are those who do not remember their past time here but he hasn't met such a person yet and has no such knowledge.]

The Trainer ID you use to contact someone on their Pokegear... the number no longer will display if they have left this place for good. Otherwise, it is most likely they are missing.