There might be nothing at all and it could simply be a writing artefacts..
..but some things are too strange:
- Carrot appeared October 26, 2015 we only have the confirmation that she was under Pedro's September 16, 2017 and we have the official colors of Carrot on volume 81 released April 4, 2016. So there is at least 1 year between the fact that Oda knew Carrot was under Pedro and the actual confirmation.> This means that Oda had probably already in mind the fact that Pedro was the mentor of Carrot and also that he was gonna die under Carrot eyes and the impact it had on her the moment he started creating Carrot. That possibility is important because it tells us a lot about the creationg of this "side character".- In chapter 811 released on January 4, 2016, Carrot is confirmed to be a Kingsbird. At this point we know that Oda already had probably in mind the fact that Carrot was coming on the sea for a long time. But this is used for Carrot to hear the story of Pekom and setup her entrance later.> But this is also ANOTHER indication that Carrot makes the link between night and day. For all we know, Oda couldve written Carrot as part of the guardians but he choose specifically to make her a musketteer and appear earlier.> Also note that at this point Oda had already Sulong in mind. And looking at the way he constructed Carrot he most probably had also in mind the fact that Carrot would be the first and most impressive Sulong moment in the Manga. Meaning that 888 was ALREADY (most likely) planned at the beginning of Zou.-- >
Now we also need to point out different things. First the characterization of Carrot. Oda had already in mind the double and radical change in personnality in Carrot, one representing the SUN, the other representing the MOON. Secondly, Oda made Carrot a rabbit, and rabbit are crepuscular (I'm sure Oda knows that as he love them) meaning that they are most active at DUSK and DAWN. And thirdly, Carrot inherited Pedro's will, the will of the captain of the NOX pirates.
So... Oda had ALL THOSE THINGS in mind in ZOu and what those things are .. are the link of Carrot with the theme of the link between the night and the day. In another word, the Dawn.
This means if if allows us to go farther, that he most probably also had in mind that Carrot would become the QUEEN/RULER of Zou.
And.... spoiler.. Everything here.. checks out. And is perfectly logical and we need no more explanation.
BUT
1. Oda also put Carrot in focus on the LOOK OUT post. Something he didn't have to do. And this is not a little focus like one or two chapters, its a long term milking of her skills and her post from her introduction to the end of Whole cake.
2. Oda choosed to let Carrot be with the strawhat the ENTIRE Wano time. EVEN when she is not on screen. This is not logical. If she is meant to be the queen of the minks, there is no reason to put her with the strawhats on multiple occasion and furthermore to put her in moment with the strawhats like this one:
3. If Carrot is meant to rule the Mokokomokomo komo kindgom, then the logical thing to do for Oda during whole cake and Wano would be:
> To make her win her fights
> To build up her leadership skills
Again, its almost a certainty that Oda planned for Carrot to become Queen from the beginning so those things shouldve been in Whole cake.
But he did the OPPOSITE
> He make her loses her fight MULTIPLE time
> He challenged her innocence
> He constructed her like a naive person
> He puts her under others leadership like Chopper.
---
So there are THREE points of mysteries surrounding Carrot's writing that needs to be explained. And the two most simplest answer are those ones:
- Either Carrot is meant to become a better ruler later and have a shining moment in the story again and something related to the dawn
- Either Carrot will discover that she is not meant to lead Zou, but to follow her desire for adventure and follow the strawhats.