Ok, so it's obvious that Swift Wind cannot change into Spirit. Which is fine, because Battle Cat can't change into Cringer.
So the question is, what can they do to Spirit to make him a must-have, instead of just a plain white horse?
Sure, he'd have a new head sculpt or something for that little headband thing. And of course a new saddle. But what else?
I'd say this would be a good place to give us Kowl, or maybe even Loo-Kee.
Any other ideas?