Ferguson is dangerous everywhere and tough as hell. Khabib can be hit, its just that nobody has been able to stop his relentless wrestling attacks.
El Cucuy is legit out there mentally. He has the craziest work out videos you've ever seen. His wife filed for a restraining order against him just to get him to seek help. I think that is why one of the times he was supposed to fight Khabib fell through.
He won't be scared of Khabib's wrestling and is a pretty good wrestler himself with better submissions than Khabib. Definitely a better striker. Its more interesting than Khabib v McGregor, where you knew that if McGregor didn't knock him out in the first 3 or 4 minutes it was going to be Khabib by mauling.
Still, if i was a betting man I'd probably go for Khabib by 5 round decision. I think Ferguson has had a lot of injuries and general wear and tear on body and mind that Khabib will eventually wear him down.