Link is not entirely hot on the idea, because he feels a little coerced into it ICly, and he doesn't trust Messenger's evasiveness, though he's shown no signs of harming blanks before. Right now Link would almost certainly prefer a Judge like Librarian, who observes rules and is orderly and straightforward and is a keeper of writings and documentation. Messenger seems to enjoy being kind of vaguey wavey and tells things on a need-to-know basis, which bothers Link a bit, given his past as a vaticaninja who didn't question orders.