Could go different ways:
Momo gives in to Ryokugyu, and let's him search the country only to find out they already left, therefore he leaves Wano
Momo somehow someway talks through that bull skull to convince for a deal to ally with the WG, making him forget of Luffy? Or again he gets stalled that way long enough so he leaves
Momondrives him out of Wano, accidentally firing an uncontrollably strong blast breath that flings Ryokugyu (off guard) far away. With him momentarily away, Yamato is officially in the crew and tells them to leave so Wano wont be under attack after they just tasted freedom, Luffy and others leave shortly after, with Ryokugyu in a hot pursuit outside Wano.
Or a last option some mix of all above.
Momo gives in to Ryokugyu, and let's him search the country only to find out they already left, therefore he leaves Wano
Momo somehow someway talks through that bull skull to convince for a deal to ally with the WG, making him forget of Luffy? Or again he gets stalled that way long enough so he leaves
Momondrives him out of Wano, accidentally firing an uncontrollably strong blast breath that flings Ryokugyu (off guard) far away. With him momentarily away, Yamato is officially in the crew and tells them to leave so Wano wont be under attack after they just tasted freedom, Luffy and others leave shortly after, with Ryokugyu in a hot pursuit outside Wano.
Or a last option some mix of all above.