i think i can shed light on big mams abilitys. i think she has a logia that lets her control wood or nature. she can make trees grow and use wood to her advantage. the reason i say this is because on her jolly roger, u can see a tree at the bottom right corner. plus, with that ability she could also have the nickname "mother nature". i mean it does sound like an ability a yonkou would have. plus, it should be powerful. but idk if it would just let her control wood or naturei n general, like make plants grow and talk to animals and manipulate them. What do u guys think?