Point is, there are guys at 12 or 20 who people will be willing to trade picks or players to get, and Dallas needs those picks or players.
If I had no option to trade, then I'd likely take
12: Styles or the best non-safety defender, preferably pass rusher
20: The best defender, or Caleb Banks if his foot is OK (passes doc inspection)
92: The best CB if I haven't drafted one. Barring some kind of insane run, there will be one really good one here.
112: The BPA at Defense, OT, RB, TE. Lots of EDGE, CBs, maybe a LB. Jalon Kilgore could be here, or if we're really lucky, Jonah Coleman.