Let him level it if he wants. Anyway, as far as leves go, there's also another set of leves. All the Limsa Lominsa levemetes out at the camp give blacksmith, armorer, and culinarian leves for the same levels as the camp (So, 1 and 5 for Red Rooster Stead, 10 for Swiftperch, etc.) For the ones beyond Red Rooster Stead and Swiftperch, however, you need to unlock the leves at that location by doing a trial battle leve, which could be a concern if you've only levelled crafts and not battle classes.