Guys, I was thinking about the perfect role for Yamato if she joins: Strategist(or Military Strategist. I put just Strategist to make it simpler). Yamato spending 20 years locked in Onigashima, trying to beat Kaido multiple times (and lost all the time), formulating better ways to beat Kaido, sounds a lot like Strategist. She even prepared a substitute doll for Momo out of nowhere, means that she is really prepared before going to the battlefield.
I was thinking about this because of 1 important panel, where Luffy was about to use Gear 4th on mere Numbers; only to be stopped by Sanji. And Yamato’s role as Strategist could be a funny theme, because of Luffy’s reckless behaviour. Yamato’s role as a Strategist also allows her to look for multiple plans, if Luffy somehow break her strategy.
If Yamato is indeed a Strategist in future fights, it will also fit that Yamato will know each of Straw Hat’s powers & weaknesses, thus when SHP fight BB later, Yamato will be the one who formulates the idea of which SH fights which BB, and role Strategist maybe underrated but it is important especially in battlefield.
I thought about this because of Luffy, Ace & Sabo’s relationship are like 3 sworn brothers of Shu; which are Liu Bei, Guan Yu, and Zhang Fei. Therefore, Yamato is based on Zhuge Liang. Also @Kai.Do mentioned that Zhuge Liang is known as Crouching Dragon, but as Dragon is already Kaido, Yamato is Crouching Tiger. And not to mention that Strategist role is kind of special role, while not everybody can be a strategist; unlike Carrot’s role to be a lookout. Again, Yamato spending most of her life trying to beat Kaido multiple times & formulating ways to beat Kaido, makes her a perfect Strategist (where I believe Carrot can’t be it)
in Japanese, Military Strategist is gunji senryaku-ka (軍事戦略家)