Do you think they will both return to BM? Did Oda ever remove a powerup from a StrawHat before? (I really want good boi Zeus to stay )
It was so funny how Prometheus was like "Right here, Mama!! Beat them up." He was like a kid who got picked on and now gets his revenge by telling their parents
It has to be temporary. Nami is relying on Big Mom's strength. Nami, if forced to, would agree that she isn't fulfilling her role as part of the Pirate King's crew if she doesn't climb up on her own strength (later). The "weakling trio" all buckle down when they have to. They take the easy way out most of the time, and that's fine. Considering it is probably Vegapunk that gives them their biggest power-up, they just have to hold their own weight until then.
Zeus has definitely given some hilarious moments, but he could just poof if Big Mom dies. Having Nami dependent on this isn't how Luffy runs his crew.
Seeing that Page 1 and Ulti are actually tight—or at least she has a crush on him, is something as well.
The blood relationship seems most likely to me (the raw will help a lot once it comes out).
GoldenVenus Busoushoku has never resulted in the visualization unless both have haoshoku. So safe to assume Sasaki, Black Maria, and Who's Who also have haoshoku.
I really think Yamato seeing Oden as a child answers all of these questions posted. He doesn't have to be old (look at Hiyori). If anything, his build/frame implies he's about that age anyway (Oda is extremely accurate with these sorts of details).