There's almost no conceivable way Correia can beat the UFC women's bantamweight champion—even with the event taking place in the challenger's home country of Brazil. But there's two major reasons why Rousey isn't a smart pick in a DraftKings contest.
First off, her DK salary is about as high as you'll ever see for one fighter at $12,200. That makes it virtually impossible for you to draft any of the other favorites.
There should be serious concern as to whether you'll be able to tab other winners from the card, and it just about eliminates the opportunity to draft other favorites.