While you fun theory would be entertaining, it would leave me pretty disappointed. I don't want to see any member of the Mysterious 6 die without Luna having been involved in the kill. She deserves everyone of those kills and hopefully they are slow and painful deaths.
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While that's what everyone in the DeLuca Fandom wants (including myself who loves Luna deeply, since she's my favorite girl), will her getting involved in every single one of those kills be possible, especially if we're basing it on the assumption Mysterious 6 are all Serpents level or even higher (which is the same assumption used in my fun theory)?
I mean yes, Luna can grow her potential to become Serpent level, but even when that happens, I just don't see her being able to fight all 6 members of Mysterious 6 by herself.
And that's where my fun theory comes in. With the Serpents taking out 2 members of the mysterious 6, the remaining 4 are each taken out by the new generation of Serpents; MC, Luna, Gracie, Jalen (who in my theory joins DeLuca somewhere down the line before the Mysterious 6 and other families attack) each fighting 1 vs 1 (and MC fighting his father).
And sure, I guess in that instance, they could be captured alive, for Luna to interrogate and kill them all (though it does have its downsides as explained in 2 paragraphs below).
But for all 6 members? I don't know.
Just seems improbable Luna will take on all 6 of them by herself if they are Serpent level or more.
What i think is that she would need allies who act as her proxies in some battles in her vengeance to fight the mysterious 6 members.
Plus, all 6 members caught alive just for Luna's sake i do find it a bit weird, because basically fighting a Mysterious 6 member i would assume would be a fight to the death, and trying to defeat while not killing leaves one at a severe disadvantage.
And to be honest, even though i do want the mysterious 6 members getting what they deserve, if the leader is MC's father, i really think MC should be the one to kill him, not Luna.
Of course, everything I've said till now is based on the huge assumption that Mysterious 6 are as powerful or even better than the current 4 Serpents.
Story could go in a way that is not the case (and if that happens, well of course the whole theory is thrown out the window lol).
But regardless, it's fun to take a stab in these theories at times i admit.