Paulo Costa responds to callout from Bogdan Guskov

Paulo Costa has responded to a challenge issued by Bogdan Guskov on social media. The nature and content of Costa's response are not detailed in the original post, which only confirms that the Brazilian middleweight acknowledged Guskov's callout. No further specifics about potential fight arrangements or the tone of Costa's reply are provided. This exchange represents the latest in ongoing social media interactions between middleweights seeking high-profile matchups.