Now take your tin foil hat, lean back and enjoy a wild goose chase.
It is highly unlikely that Gracie and Luna will fight each other. From the opening we also seen the MC with the two sisters and Isabel.
This four I assume show us the next generation of Don or Serpents for the Delucas. Wilfred (Consigliere), Cordia (Donna) and Antonio (Capobastone) is not in the picture. Could simple be for artistic reasons, but for what then do we have our hats on? - Even Wilfred changed his.
What we also have seen is, that Antonio killed the traitor before he could say something.
Antonio is also a little older than the two sisters and, if I'm not wrong, have a different father than this two.
As Capobastone he is the direct successor to Cordia and would gain the most if she, for what reason ever, would retired.
Do he have an agenda on his own? I don't doubt it. Wilfred clearly has his on too. The important question is what does his agenda goes against the goals of the family?
I believe so. We had a lot of incidents already that shows that someone of high rank of the house collaborate with an enemy.
First the malfunction of the car breaks, then the beach prison event and at last the poisoning of the MC. Additionally the assassination attempt on the MC.
Two of them where on the main estate and all involved the core family in a way.
Does Wilfred, Cordia or Antonio doesn't know anything about them? Can it be that all of this fly under their radar? Or is someone directly involved and the others turn a blind eye on it?
My assumption is that Antonio is involved, possibly even in Luna and Gracie childhood events too. His distance to Isabel is also a part of it.
In reaction to this MC and his group will need to go "against" the family to discover this and in the end, Wilfred and Cordia needs to retired.
So now, you can either take your hat of or join me on this goose chase.