Very excited for this fight but I think you are overrating Khabib just a bit. Some of the most vicious ground and pound in history? Guy has ONE stoppage from strikes on the ground against a can. Iron chin? Completely unproven at this point.
Khabib's cardio and takedowns are incredibly good. However, I am not as impressed as others with stats like he "scores the most takedowns per round of anyone." Really, IMO, that just shows that people are often able to get up after he takes them down which is not an efficient way to fight; I don't care how good someone's cardio is. Boring as it may be, if a guy like Jake Shields or Jon Fitch get on top of you, that round is over.
Also, Khabib's standup has looked very weak in the brief times we have seem him standing. Michael Johnson, who was never top 5 and is 1-5 in his last 6 fights, was lighting Khabib up before he got taken down.
No matter how many times we've seen hyped fighters get exposed, people always seem to delusionally think that one guy's dominant strength has the answer to beat all contenders. Khabib's grappling is amazing but how would he fare against a top wrestler who can stuff his takedowns and control the standup? How will his cardio hold up when he is taking damage and isn't getting takedowns at will? There are a lot of question marks around him still and until he is active for a long stretch of time (only 4 fights in the last 5 years) and faces a wider ranger of top competition, it is tough to read his full potential.
That being said, I still think he beats Tony. Ferguson has a very long win streak, but just like Khabib's record, none of those names really jump off the page at you besides RDA. Tony has a huge striking advantage but so does everyone who faces Khabib and I really don't think it matters. I think Tony's wrestling is a tad overrated and none of his previous opponents have the offensive wrestling to give me any sort of confidence that Tony can stuff Khabib's takedowns consistently come fight time. His defensive guard didn't look great against Kevin Lee either and I just think he will get worn out after being taken down over and over.
TLDR: Khabib in another non-telling UD win. When he faces a truly elite defensive wrestler though (which LW sorely lacks atm), he will get exposed badly