Think we’re all missing something worth noting - even if Carrot joins the crew with Yamato, the focus will unquestionably be on the latter regardless. Several other main characters have basically become set dressing as it is, there’s nothing for the rabbit to do going forward unless the full moon is out and nobody obstructs her view like many people could do in a variety of ways…whereas Yamato’s still keeping a Yonko at bay by herself, moon or not. There’s space on the ship for both, but only Kaido’s offspring has any narrative impact
That's always bad.
Law inclusion changed the entire Dressrosa.
Oda knows the hype over Yamato, he could easily subvert the character because of what you call Narrative Impact.
It'll be more impactful actually if she doesn't join.