Questions & Mysteries Why didn't the dukes tell WB what happened?

[Bullet]

We saw the WBP in Yamato/Ace flashback saying they only heard about Oden a few years ago because information doesn't get out of wano but the Dukes have been outside of Wano rulling their own country since 20 years ago which is the same year Oden died why the fuck didn't they tell Wb sooner?

 

[Orojackson Refugee]

they love oden so much so they were still grieving (they need at least 10 years of grieving for a great man like oden) - Oda

 

[GrandmasterChef Zonji]

We saw the WBP in Yamato/Ace flashback saying they only heard about Oden a few years ago because information doesn't get out of wano but the Dukes have been outside of Wano rulling their own country since 20 years ago which is the same year Oden died why the fuck didn't they tell Wb sooner?

The only explanation in my mind is :
1. The Dukes (Neko and Inu) are not allowed to get out from Zou by the old Duke Hitsugisukan. He is Really Cares about them and even Teaching them about the past of Kozuki famliy and Minks tribes. Since They are one of the Scabbards of course they will be hunt by Kaido subordinates but They can't go to Zou without Vivre card. and when you can't get out of course you can't tell WB.
2. Just Like Wb said even if They tell to Wb it will be useless since Wb doesn't want to bring so many casualties to both yonkous especially to the Country and His Crews. Even Marco and other Commanders at that time still young.
3. just like @Orojackson Refugee describe .

 

[Fuckthis3]

Bullet you know the answer start witn a "0"

 

[ShinichiMugi]

Neku and Inu werent even talking at each other at the time. I think they never talked about travelling to fight Whitebeard