Sign Brown first. If he won't bite on a contract offer, then try to sign Jones but my gut tells me some team will over Jones a stupid contract and he will take it. Don't be surprised if that team is the Giants or Eagles.
The Cowboys 1st priority is and must remain DT or upgrading that DL. They need more than just a 1st round draft pick. They need a free agent or two as well. If they can get a top DT in the draft, another stud in free agency, and then sign a DE to replace Quinn, the CB spot will be less concerning, at least for 2020. They can draft depth in the later rounds.
Who here would not be happy is the Cowboys went DT, Safety in rounds 1 and 2?