Some people already theorize that:
1. Nami will get Hera (
)
2. Hera will die and Zeus will come out (
)
3. BM will create another homie just for Nami (
)
With killing zeus Oda take the possibly of Nami getting a homie powerup away. And it make sense since people make a big mistake with thinking that could be Nami powerup.
First it is still BM power, the soul can´t life for ever, if BM get killed Zeus die too.
If Nami build up now all her moves in combo with zeus, she losing that power later, with mean it would be like Luffy losing his df power.
Because that it can´t be Nami powerup and Im happy that Oda choose the way where actually Nami not getting a homie, I mean that would be boring asf, not even her own powerup.