I think the issue is getting ready for it is a lot harder than you would think. Even Izzy had trouble in the rematch and it was part of the reason he lost the last fight.
I don't think you can truly "get ready for it" in the sense that you can't learn how to effectively check calf kicks from arguably the best calf kicker we've ever seen in a year.
In fact, it just might be impossible - you can't just decide to become Jose Aldo/Jan B., those fighters were molded by unique fighting journey's. No matter how much a fighter might try to learn these techniques many times they still won't be able to effectively implement them in a fight (at least consistently against a high-level low-kicker).
But that doesn't mean you have to focus on just checking them - it's an MMA fight, not a pure stand-up fight, so the key is really to look at the situations where guys can utilize calf-kicks and how to avoid/counter those situations.
The opening for calf-kicks typically comes from sitting just outside the edge of boxing range and having no blend of bounce/feints. Essentially you are just sitting inside the edge of kicking range (where only low-kicks are available unless someone takes a big step forward) daring each other to throw first.
In those situations the fighter being offensive can momentarily distract to create an opening to crack that low kick before most opponents can typically react. So the key is to really avoid being at that range without having some sort of movement and offensive threat - you stay further outside to make them come to you and you can collapse the pocket on your terms, you use a throwaway strike to collapse the pocket yourself, you feint level changes as you pressure to discourage low-kicks, etc.
Now all of these strategies have their own risks, but for me personally I'd rather do anything than sit on the edge of boxing range against an elite calf-kicker. It's basically a guaranteed way to lose slowly, so you might as well take a different approach since they'll all have a higher probability of victory.