Dark Horse can't stop and won't stop. Already 800K and should push platinum after the holidays are said and done.
Capitol would be foolish if they chose not to go with Dark Horse. I know Katy WANTS Birthday as the third single, but I don't this she has much of a choice at this point. Radio, especially Rhythmic, is going to play DH regardless of what Capitol "sends" to them. The demand is just too high.