
She little brother zoned Kaido when they were on the same crew and knowing that dynamic and Oda, Linlin should not only be stronger but with gag force be able to completely bypass Kaido’s durability without trying.
Kaido had to be gifted his devil fruit by her because he was apparently so weak and too much of a damsel on distress being captured by the Navy over and over.

SOME L’s CAN NEVER BE WIPED AWAY. No wonder he is suicidal, not even Pre-Timeskip Luffy has ever been captured by the Marines.
Big Mom had zero regard for Kaido’s threats and sailed into his territory with just her main ship while missing 3 of her most valuable fighters. This implies that she thinks the “disadvantage” is redundant because she can handle Kaido and his crew while handicapped and that she believes her officers and lesser commander Smoothie are more than enough.
Base Big Mom with just Napoleon stalemated Kaido but wasn’t all that serious. She also has more combat intelligence than Kaido surprisingly enough to the point she has to yell for Kaido to dodge attacks that’ll kill him. Hell Linlin wasn’t even sustained with an actual meal beforehand to meet her caloric needs and still finds the thought of Kaido killing her laughable.

Her durability is indirectly being portrayed as superior to Kaido’s, having yet to have bleed and I don’t recall any instances of her crying out in pain. Her Conquerors Haki is also so strong that it has an echo effect that was never before seen, knocking out people floors away while only directing it at two people.

Law and Kid individually are like 80% as strong as Luffy at worse. So fighting them both together with nothing but a smile and some dirt is a better feat than fighting Luffy alone really. I feel this is overlooked too much since everyone is apparently mesmerized by Kaido and Yamato fighting Kaido.

Finally. Luffy still has business with Big Mom and she will be relevant for sure past this arc. Kaido is losing and popular theory is that Zoro kills him.