I personally think that August at the end would have been a bit much. I do like that he might have been there earlier. I mean if the Mad Hatter believes he’s trapped in the house, what would prompt him to try and go out. If a stranger shows up at your door seeming to know too much, and he starts directing your observation of Emma, and Mary Margaret; and how Emma’s arrival coincided with changes to Storybrooke. Not to diminish Jeffersons powers of observation, but it seems like him getting a little guidance from August makes sense to me. Just as Rumplestiltskin oversees and directs how events seem to unfold; for some unknown purpose. AWB seems to have that same insight, we just don’t know his purpose or powers yet.