Probably depends on who witnessed his death and if the news gets published or not
Considering that most of the marines were ko'd by Joyboy's haki, they probably didn't witness him getting killed
- If it gets published that Saturn got killed, the Blackbeard pirates will know about it
- If it doesn't get published, she might still end up infiltrating MJ, just that she'd not manage to arrive at the Gorosei room without them noticing
I think it just shifted the way that plot would be used
Considering that most of the marines were ko'd by Joyboy's haki, they probably didn't witness him getting killed
- If it gets published that Saturn got killed, the Blackbeard pirates will know about it
- If it doesn't get published, she might still end up infiltrating MJ, just that she'd not manage to arrive at the Gorosei room without them noticing
I think it just shifted the way that plot would be used