a few plot threads that needs to be addressed regarding tama is;
- tama doesnt know about ace and luffy being brother
- luffy doesnt know about ace's promise to her and her wanting to join his crew
- her fruit power needs to come into play, considering all the build up it got and all characters saying how useful and amazing it is.
- the missing year in her time line, Tama just turned 8 years old, but she met Ace when she was 5, but that was 4 years ago, not 3. this was never corrected in the volume or in the anime so i believe its an intentional hint for there being more to it, similar to how Momo met roger but the fandom dismissed it.
theres also the possibility of her fruit number fitting into the number pattern.
i believe her power is the tsuku tsuku no mi, 2,9 2,9. tsuku simply meaning attach.
and it is inspired by doraemon actually,
https://doraemon.fandom.com/wiki/Momotaro_Jirushi's_Millet_Dumplings
and this was cleverly hinted in the sbs of 93 where Oda mentioned the tanuki teapot being emotionally attached to tama (and hitetsu)
as well as the pirate apprentice position being mentioned for the first time way back in volume 2, and then the connection between tama and ace being hinted at back in marineford.
as well as her being a straw hat weaver in a series which got two very important straw hats, and she is from the amigasa (straw hat) village, and wore Luffys strawhat... Im thinking the man with the amigasa that met up with crocus could also maybe have a connection to tama.
so whats the point of Yamato then? I believe she is simply a red herring tbh
but she needs a power up of some kind, yes, I dont know whether itll be her purposely not showing her capabilities yet, or if she will master more of her DF so she can get a physical power boost somehow or even some weird time jump trope although i prefer her to stay a kid.