No proof she used adcoc. It was only mentioned that her conqueror haki was unleashed which is a natural thing to her(it awakes even in her mother caramel moment)
Those people who were getting knocked out from her COC in another floor.
Why would Big Mom use mother caramel mode here?
We know adcoc causes ripples of CoC which can knock people out.
There's no way she was using normal CoC since it wouldn't affect Law and Kidd
And the clash ended in a statut-quo. Vista wasn't using a named attack either.
Which shows it isn't comparable to Big Mom v Law and Kidd.
In fact Mihawk was even looking elsewhere whiles fighting Vista which shows the difference in seriousness
No one said he wasn't. Point is he faced a stronger adversity(admiral+fleet admiral), yet managed to sink 2 of their ships
We don't know how he sunk them or even whether an admiral was on the one he sunk. We know he has no long range attacks which means it is very likely, he wasn't the one who sunk them directly.
Sinking ships isn't that much of a feat to begin with.
Jack's superior was already two shotted by an even weaker Big Mom