Nice but.. Having Sea Kings just decimate a fleet would be anticlimactic, it's implied a whole WAR will happen again.
I see Hancock and the Grand fleet coming in to help Luffy out.
It's not just Sea Kings, it's the broader implication. Nobody knows of Poseidon once again being active. WG knows Joy Boy is active again after 800 years and now he has allied with Poseidon just like back then.
Yonko Mugiwara no Luffy repeatedly and with frightening pace does things none of the previous yonko ever did. And that scares the WG.
WB, BM, Kaido and Shanks strived for peace/balance or put together 20+ year old plans of building armies. None of them got close to creating the chaos Luffy does on a daily. Just look at the list below
Heritage
-D clan
-Grandson of Garp
-Son of Dragon
-Unknown: "Husband" of Shichibukai Hancock
-Brother of Ace, Rogers son
-Brother of Sabo
Against WG
-Burned WG flag and destroyed Enies Lobby
-Returned to and destroyed Marineford
-Broke into and out prisoners at Impel Down
-Now(?): Kidnap assets Vegapunk and Bonney. Turn top agents Lucci, Stussy, Kaku and Sentoumaru against WG. Destroy Marine Fleet headed by Gorosei Saturn and Admiral Kizaru.
Legendary
-Sworn alliance of several kingdoms. Drum, Alabasta, Skypiea, Fishmen Island, Dressrosa, Wano. Brother Sabo possesses relation to many of the remaining countries and together they have almost all in their control.
-Possesses Grand Fleet and other loose alliances. Unique ability of turning foes into friends. Most dangerous ability in the world.
-Defeated, befriended or conquered most Shichibukai: Doflamingo, Crocodile, Moriah, Hancock, Kuma, Mihawk, Jinbei, Law, Buggy.
-Defeated, befriended or conquered most Yonko: Whitebeard, Kaido, Big Mom, Buggy, Shanks.
-Awakened Joy Boys God fruit Nika.
-Possesses only Ohara survivor Robin that can read poneglyphs. Possesses Franky, inheritor of Pluton blueprints.
-Possesses ancient weapon Poseidon and her Sea Kings. NEW information that nobody knows.
Now(?): Acquires New Pluton through Vegapunk and Franky. Leaves Uranus but at this pace he'll gain it in months.