1. Wrong, her saving Marco helped the alliance. Plus she was gathering weapon and supplies which helped greatly during the war
yes we had. Robin had a LOT LESS significance before she join after Alabasta. Carrot had the entire arc of whole cake. Again. Just because there was an arc between the two doesn't negate what happened during Whole cake.
Their is a difference between a character who is officialized/recruited/asked by Luffy (Jinbe/Brook/Usopp) and a character who joined the crew (Robin before water Seven ; Nami before Arlong Park).
An official character has already made his proof both in a physical and narrative way (haaving a strong batch of chapter and a strong focus) and is already part of the acting crew as ".... the ... of the ship"
On the other hand the one who just joined the crew is not an official strawhat yet. They are just a "future" strawhat. (and we can usually tell that because the character as every thing the strawhats have) they still have to make an impression on the reader, either with a big arc centered around themself or a batch of chapters and a focus later.
Carrot will be in the second case as she will much likely stowaway. The real focus on her will come after. And only after those actions or focus .. will Carrot be considered a real strawhat.
An official character has already made his proof both in a physical and narrative way (haaving a strong batch of chapter and a strong focus) and is already part of the acting crew as ".... the ... of the ship"
On the other hand the one who just joined the crew is not an official strawhat yet. They are just a "future" strawhat. (and we can usually tell that because the character as every thing the strawhats have) they still have to make an impression on the reader, either with a big arc centered around themself or a batch of chapters and a focus later.
Carrot will be in the second case as she will much likely stowaway. The real focus on her will come after. And only after those actions or focus .. will Carrot be considered a real strawhat.