Why are we assuming that King and Queen fought Greenbull? We know that Luffy and Zoro took a week to finally become conscious with medical health. Meanwhile King and Queen landed in random spots of Wano, getting no aid from anyone. And don't use the zoan excuse. Luffy has a much better zoan fruit, but inspite of this and medical help still took a week to regain consciousness. He could of absorbed then Cell style while they were unsconscious as the spoilers never stated neither of the YCs condition when Greenbull consumed them.
Guess we'll find out soon enough. Not really sure the point of him absorbing dudes that were still unconscious after a whole week but we'll see. I mean, Luffy and Zoro took much stronger attacks than King or Queen so I don't really need to bring up the zoan thing. Regardless, we'll find out soon enough, maybe he didn't fight them and just saw two Calamities unconscious and absorbed them.
I too believe Sanji will fight GB tbh, but some of them are willing to ignore Queen's defeat to celebrate King's downfall. Zoro guys are at least trying to save King despite knowing he too has a chance at being GB's opponent.
There is a limit to what Zoan's can heal from too. I think we've seen Luffy recover from scratches and such plenty of times. Doffy for example stabbed him multiple times and cut him with 5 colored strings and Over Heat but none of these scratches remained with him. Not to mention, Katakuri literally left a hole in his body and it healed rather quickly. Also, Luffy took more damage than Lucci during EL but he recovered quicker than Lucci.
He didn't really recover, those wounds were still on him he even got scars from past battles, ancient zoans can't get scarred, ulti got a hole through her stomach yet somehow survived and completely healed atleast on the outside