What. Neither O'Malley or his opponent is ranked. They don't even deserve to be on the main card over any of the other announced fighters. But just for shits and giggles, lets take their popularity into account and look at the card. Because we know popularity/marketability is what WME loves.
Here is the main card as I see it so far. I'm mixing popularity and ranking but giving more weight to popularity.
1. Main: Champ Lightweight
Khabib Nurmagomedov(c) vs. #1
Conor McGregor [a]
(no explanation needed, hugely popular, ranked at the top of the division)
2. Co-Main: #2 Heavyweight
Derrick Lewis vs. #5
Alexander Volkov
(Derrick is hugely popular and has more of a following than O'Malley on social media, on top of being, you know, ranked at the top of his division. This is a no-brainer for the co-main and it's set in stone)
3. Women's Strawweight #7
Michelle Waterson vs. 8
Felice Herrig
(Ranking-wise Pettis and Formiga should be ahead of them, but popularity wise, these ladies dwarf everyone else on the card except the main event. O'Malley isn't even close. Look at the Instagram #'s. Also, Michelle is a WME client and gets treated as such)
4. Flyweight #2
Sergio Pettis vs. #5
Jussier Formiga
(If we were just going by rankings, these guys should easily be in the #3 spot, but only Sergio has any kind of name and it's not that big considering how long he's been fighting. The dude is kinda bland. I could see this getting bumped to the prelims to make room for O'Malley. Which would suck, but WME)
5. Light Heavyweight #7
Ovince Saint Preux vs. #12
Dominick Reyes
(These guys have very little hype or following online. Rankings wise, they should be on the main card, but I can totally see them being bumped for O'Malley)
So, in summary, judging mostly on popularity, I think O'Malley has an outside chance to get on the main card, but no chance in hell of getting the #3 fight spot over someone like Michelle Waterson. Never mind co-main over Derrick Lewis. LOL.