Huh.. a bit odd, in my opinion, to get him Casa Blanca instead of something else, like Firesweep Lance, or Slaying Lance, since he can't really counter ranged units.
I guess it's more of a safety measure in case he can't get away?
Completely understandable. Other than that, I don't really see anything worth pointing out.
Except for maybe Aether? Maybe, outside of Tempest Trials, I'd use Ignis/Bonfire, but that's more of a preference rather than something to point out as a 'flaw'.