Will Nami Keep Zeus. At the end of the day even if wants to eat those clouds Zeus is still apart of Big Mom soul. Nami will not acquire it.
The assumption is that when Big Mom dies Nami will have Zeus with her. I think she should it would be a dope power up I think Big Mom should retain OLin permanently for Nami to keep Zeus and Prometheus. Big Mom chases Nami but just as she closes in Franky comes and saves her.
If Big Mom takes back Zeus whatever power Nami gains in this arc will have been for nothing.
So this is how nami will keep Zeus in the story. Whether the unlikely scenario happens or not I am making an assumption which if true then Nami will definitely inherit Big Moms fruit. I think its safe to say that Nami will end up with Zeus at the end of this arc. Nami will not acquire it.