Oda said Warlords & Marines counterbalance 4 Emperors before Timeskip.
Kuma lost his Humanity before Timeskip.
He was introduced as King of Sorbet & was said to be Ivankov's close friend before Ts.
He talked of Monkey D. Dragon before Ts.
Bonney wanted to avenge Kuma before Ts.
Vegapunk was a character before Ts.
Make no mistake, this entire Final Saga was mapped out way before.
The Doflamingo & Kaidou sagas were what was added into the story before Final Saga.
Kuma lost his Humanity before Timeskip.
He was introduced as King of Sorbet & was said to be Ivankov's close friend before Ts.
He talked of Monkey D. Dragon before Ts.
Bonney wanted to avenge Kuma before Ts.
Vegapunk was a character before Ts.
Make no mistake, this entire Final Saga was mapped out way before.
The Doflamingo & Kaidou sagas were what was added into the story before Final Saga.
Make no mistake most this shit not plan out , Oda even said he did not expect Law would stay so long with SH etc etc .
Also Yonko were big part of Oda 5 year plan i doubt Kaido saga was just added into story like everything else Oda can't help but expand shit .