Good video by Morj. An eloquent reiteration of what I and many others had already said in this thread. Even mentioning the idea of Yamato becoming the temporary shogun of Wano until Momo's of age.
Last chapter, Yamato got sent away from Luffy and the crew to instead look after Momo. This could be the beginning of their relationship and the path for Yamato finding who she really is and Momo developing trust in her, even though her father killed his father.
We saw from her talk with Luffy, that the latter hardly cares about "Yamao" and was far more interested in other things. We'll see how her time with Momo goes. Whether it's played for gags and is a brief thing, or whether it shows the signs of a closer relationship yet to come.