Can you guess? Isn't it funny how Conor and Nate disappeared for almost 2 years and now they both get announced at the same press conference? You guessed it, they have the option for Nate fill in for a last minute replacement. While the Khabib fight is huge, the 3rd Nate fight will always be big, and they need some sort of backup plan when dealing with this much money at stake. It's very smart of the UFC to have this backup plan. Kudos to them for actually thinking ahead.