Be careful Yamatos cover story just introduced a west blue individual who “died” to Kaido.
Fujitora being a Kaido hype tool is possible.
We know Zoro's dad died in a battle with pirates.
I think Arashi travelled to Wano to fight Kaido, and got destroyed. BUT, Arashi was smart, and told Kaido he was from the West Blue, not East Blue, so Kaido wouldn't look for Zoro/Tera in the East.
I think Fuji left Wano awhile ago, after the Kurozumi hunt, and blinded himself, as a Kurozumi.