I agree with this. My first instinct was that Merlin wouldn't go back. But then destina convinced me he might go to tell Gwen in person (and that Percival might show up looking for him to take him home). Then I thought of what I really wanted was for him to see Gaius one more time, and that was enough to make me think he might go back (though not permanently!) But Gaius coming to find him makes sense to me, too.