It makes a lot of sense to me. :/ As it is "which pairs would get along" is another layer of difficulty on Kuja. If you wanted to play the video games and focus on mechanics over storyline and characters, you'd...be playing the video games and not apping to Route where there's months of time passage on stuff.

And I still have the thing where IC'ly, there'd be NO logical IC reason for Kuja to want/keep a Ditto; the dragons are what he's comfortable with, and the few non-"dragons" he has are there for IC reasons, so ... yeah ...

And even though he's not a "good" person really, he's still not really going to do the video-game solution of "Well, breed for an egg that hatches female, then inbreed through that!" because ... really it's a long-running thing since the only thing he'd ever had around that wasn't "enemy/target" back home was a dragon, so he has more empathy for his critters than he does for other people, and he understands enough science to know that inbreeding's NOT a good idea.

And I don't want to get him a Ditto just because he's a Breeder, and I don't think it really adds anything to the plot/CR/etc. for Route in general to have Dittos mostly be something Breeder characters put on their roster as a necessity that serves no other IC purpose.