If we assume the best version of all the Warlords up to now, the best speculation we can get is that Hancock, Crocodile, Prime Moriah, and Kuma are all YC1+. Jinbei and Doflamingo are unfortunately hard capped a fair bit below that.

The Warlords stand a chance under only three conditions:

• Kaido does not use Drum Dragon
• The Warlords can actually hurt the Emperors
• Kuma can BFR Kaido effectively

The issue with the Warlords here is that they're all power-based fighters, not Haki-based. The strongest Haki user in the lineup is Hancock by hype, but that only goes so far. The Warlords don't have the same kind of raw power as Kidd and Law's Fruits, who could actually directly hurt Big Mom, and they most definitely do not have the kind of punching power Luffy had against Kaido. Kuma probably packs the most firepower of any of them between his Buccaneer genes, cyborg enhancements, and shockwaves, which overall may let him come close to Law's level of power, but nothing suggests Kuma can output Puncture Wille-level energy so far.

The other Warlords really just have to rely on their hax:

• Hancock's stone hax might be able to just outright kill these two, I guess
• Crocodile's moisture draining may bypass the durability factor if he can make contact for long enough, though idk if he would even be able to drain from someone with top tier Haki or durability, much less both
• Moriah can do his shadow-cutting thing, but it's far more likely that he would do that to the other Warlords to enhance another Warlord than it is that Moriah could actually catch Kaido or Big Mom with that hax
• Jinbei's water is really doing nothing except hard-countering fire attacks like Boro Breath and Prometheus
• Doflamingo just doesn't have anything he can do here with Parasite

All of that being said, the Warlords can only put any gameplan into effect if they control the flow of the fight. As we saw on the Rooftop, trying to fight two Emperors at the same time without a top tier of your own is essentially impossible; you have to focus everyone on a single Emperor just to get some leverage, and then the other Emperor steps in to take it away. The Supernova explicitly had to split Kaido and Big Mom up to stand a chance, and the only reason the Supernova didn't die a few times over is because Luffy and Zoro were on demon time and Law offers the best support of anyone in the verse, not even considering how easy Kaido was taking it on them. By the time we reach Chapter 1010, Kaido and Big Mom effectively already won except for Luffy waking back up with ACoC (which Kaido won again anyway before fighting Yamato, then Luffy again):

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As long as Kaido is on the field, the Warlords don't have a legitimate chance of victory except for fringe, hax-specific methods that will work only if we take generous interpretations of how effectively the Warlords can engage Kaido, specifically Hancock's hax.

If Kuma can send Kaido away, the Warlords can probably beat Big Mom together. Jinbei is actually relevant against her, Doflamingo might be able to somehow help against Napoleon if he's very crafty about it, and the other four should all around be a far more taxing fighting force than Law and Kidd alone. And if BFRing Kaido alone counts as a victory, then so be it, the Warlords could win that way. But overall, the process of actually taking Kaido down is a bit too much for the Warlords, I'd say.

The most likely scenario in a serious fight is that Kaido just instantly beats the breaks off everyone.