Garyu seems to be with Lutecia all the time as well. Caro can also summon the humongous Voltaire if she wants to crush a town or two. She's a proper summoner, alright, but since she's a dragon summoner, I guess in practice it seems like she doesn't summon as often as those summoners who specialise in summoning lesser things. At least she can use other kinds of magic to make her more useful in the mean time, as dragon summoning doesn't seem good for every day use.