"Stuck in the Middle"
In this scenario, the first 15 picks go like this:
Dallas is now on the clock. NO TRADE DOWN opportunity materializes. The draft is too deep; it's a buyer's market and no one is willing to give up comparable value.
Who do you select for Dallas?
NOTE: let's not argue about whether a team listed before Dallas would actually take one of the players mocked. In this fictional scenario, that's who they took!