People should focus more on Tama's comment in the summary. Spoiler provider is reading that thinking her "enemy ship" comment stands out.
Another group is on Onigashima i guess, either the BMP or something else entirely.
And to those saying it could have been a beasts pirate ship: Kaidos entire crew was on Onigashima and Luffy/Jinbe destroyed all other ships on the sea. Tama was with Luffys crew prior to the battle, so I dont think she was using Babanuki's group to get to Onigashima. And if they were, they would have been controlled and fighting with her and protecting her most likely