(Edit- I swear I have the yap yap fruit actually lmao!)
Amen man! I think they should ally with the loss of their captains and carry on the plans Big Mom and Kaido in their stead! Plus it would give the BMP a much better chance of saving Pudding and the Beast Pirates can seek revenge on on the Supernovas/Luffy and co with the help of the BMP (Although Katakuri and Pudding would not want that ofc) and also especially the Marines, with Green Bull being their biggest target naturally ofc!
I strongly believe King will return as Oda even brought back Foxy, Krieg and Gin (when ALL hope was lost for them especially Gin by this point), Gaimon and even the guy who was supposed to have died to Bellamy on Jaya!
So I think, no I'm sure, I'm certain, that King WILL return, we didn't even get a flashback to see the Lunarians, where they lived, how they were wiped out (presumably the flood to think of it but they lived high up didn't they? On the red line or something? I guess an ancient weapon wiped them out? Or even my ultimate fantasy of a water logia user? haha) and Oda did this storyline with the Seraphim as a hint to King's storyline not being done yet imo.
Oda also gave King way too an amazing design and that whole dramatic reveal and I doubt he's gonna waste that by never making him return. He didn't kill off King when he had the chance and I doubt King is dead either now, he might have been taken to Impel Down which can lead into another major Impel Down breakout potentially, we might get more lore on Impel Down and even demons too finally with it (and thus explaining the demonic nature of the staff) and maybe we'll find out why King's outfit looks similar to Impel Down staff and thus Shiryus? Naaaaaah lmao.
But seriously, I'm sure King will return. Hell, Oda loves making his villains, his antagonists fail upwards, with Buggy being the most prime example ofc, followed by Lucci but even look at Enel, Judge and Caesar, Wapol, now Krieg and Gin FINALLY and THANKFULLY ofc and so on.
King will return, I'm certain of it, just like Kidd, Killer, Law and Bepo etc. We might even get the most unholy, unexpected, unlikely, craziest, most badass, most awesome, most epic alliance incoming for all we know!
Oda said something to the point of wanting everyone to be there for the final big party/banquet of One Piece, that he couldn't just kill people off for it so I suspect people who were meant to die in Onigashima like Hawkins, Izo and Ashura may not even be dead, although I'm assuming the Scabbards did recover Izos and Ashura's bodies and buried them ofc?
Maybe not everyone will come back ofc, maybe some will stay dead regardless but Oda could always be cheeky and bringing some One Piece Oda Tensei I mean Edo Tensei somehow with Morias fruit, Brooks fruit or even Big Moms fruit potentially or some kind of resurrection fruit or some kind of resurrection power in One Piece somehow somewhere?
I know I'm awakening my cope cope fruit but I strongly believe a lot of characters who should be dead and gone will return sooner or later, after who has returned recently, I've never had more faith in it so far!
If King does never return though, I'll never forgive Oda never mind what the likes of Calypso, TAC, Jackteo etc will do to Oda LMFAO! (Throwback to when Queen at least implied King was a sadistic, perverted torturer too lmfao)
Along with not giving Kaido and Big Mom awakenings, I'm FURIOUS or even Furiosa/Furioser/Fast and Furious that Oda never gave a guy called KING, KING'S HAKI! THE RIGHT HAND OF KAIDO! THE STRONGEST LUNARIAN POSSIBLY! A YONKO COMMANDER 1! KATAKURI HAD IT BUT NOT HIM?! DON CHINJAO HAS IT?! YAMATO?! (Screams into the abyss). Oda be TROLLING!
Fuck Oda man lmao.