Both arcs deal with starvation. First the Krieg Pirates, and second with Sanji and Zeffs flashback. The people of Wano have had a food shortage, and been starving for decades.
Both villains were touted as the World's Strongest. Krieg was self proclaimed, while Kaido is Worldly accepted.
Both Villains were known for their durability. Krieg with his impenetrable armor, and Kaido with his impenetrable Dragon skin.
Kreig was known for using underhanded tactics like poison while fighting.
Kaido has a subordinate known as "The Plague", and Jack used biological warfare on Zou.
Both arcs, Zoro was heavily injured by Top Tiers. On Baratie it was by Mihawk, on Wano it was by Kaido and Big Mom.
Both Krieg and Kaido were proud of their "Military might".
On Baratie, Luffy was known was the "Chore Boy". In Rox, Kaido was the apprentice, aka, the "Chore Boy."
Both Krieg and Kaido's Right Hand men followed them because they admired them for their strength.
Now all that's really left to see is how the Gin/Krieg Kaido/King parallel is going to play out.
Both villains were touted as the World's Strongest. Krieg was self proclaimed, while Kaido is Worldly accepted.
Both Villains were known for their durability. Krieg with his impenetrable armor, and Kaido with his impenetrable Dragon skin.
Kreig was known for using underhanded tactics like poison while fighting.
Kaido has a subordinate known as "The Plague", and Jack used biological warfare on Zou.
Both arcs, Zoro was heavily injured by Top Tiers. On Baratie it was by Mihawk, on Wano it was by Kaido and Big Mom.
Both Krieg and Kaido were proud of their "Military might".
On Baratie, Luffy was known was the "Chore Boy". In Rox, Kaido was the apprentice, aka, the "Chore Boy."
Both Krieg and Kaido's Right Hand men followed them because they admired them for their strength.

Now all that's really left to see is how the Gin/Krieg Kaido/King parallel is going to play out.