Worstgen
Tyki_Mikk
I don´t see problem to show basic adv CoA because we already see it pre ts, same goes for advanced CoO. Only advanced CoC/Gura Awakening and probably last stage of advanced CoA(Luffy learn it) would kinda spoil to much, also the real power of two Monsters would kinda spoil something too. But in the end I don´t think it would be bad to show the begin of the fight with some cool moves(Finally seeing Roger ability)
Tyki_Mikk
And a finisher move where both attack each other with Advanced CoA attacks who did more then just split the sky(Islands get split or storms happen around the area, grandline shaking). The endresult of the fight could spoil something aswell, at least the destruction power of these monster could show how much can go a top tier. Probably because that I can even see Oda offpanel the result of the fight.
Tyki_Mikk
As he did with Oden vs Whitebeard where he cut off and show a panel where all eating together, can see he doing it here aswell.