We gotta see Kuma vs Saturn.
No we don't, you don't understand Kuma's character if you want to see that
Kuma is a Pacifista (Peace lover), it would be out of character for him to go and fight Saturn as "revenge" when all he wants is peace
Even Kuma rampaging Marie Geoise is out of character, that's not what Kuma would do, he is a Peace lover
Everything Kuma did in his life was for peace, not for revenge
All Kuma wants is to be liberated and to live happily, not to do harm to anyone
I'm very convinced that Kuma's soul was swapped with the ancient robot's soul
Kuma (ancient robot's soul) is rampaging Marie Geoise because that's the ancient robot inside Kuma
The ancient robot (Kuma's soul) reacted to the drums of liberation because it's Kuma inside the ancient robot and Kuma has waited for them for his whole life
The flashback will end with this huge reveal and plot twist and then we'll see Nika come back and the ancient robot react again, that's where Oda is certainly going with all this