Theres a theme of Yamato, Momo and Carrot all being burdened with roles they all don't seem to want. Carrot as King/Queen of Zou or w/e, Momo as Shogun and Yamato to stay in Wano and be its guardian. I don't think its coincidence ofc.
Momo still wants to be with the SHs too, he wanted Zoro to train them, hes feeling doubts and that he can't protect Wano, that he's not ready yet. I think he was just putting on a brave face once again for the people's sake.