I like Mog but he isn't really a go to guy for me. However to get all his dances you need to grab him now and do a walk around the Lette River into the velt then the serpent trench. Then reclimb mount Koltz. He makes a great leader in the second half with his personal relic where you won't get in random encounters making getting Locke early doable. He is a ok Dragoon however.