While you don't want to draft solely for need, you do need a certain number of players at each position. Okay to get along with one kicker, one long snapper, one punter, maybe 2 quarterbacks, but if you're running a 4-3 defense, you need at least 6 or 8 linebackers, and at least 8 or 10 offensive linemen.
So who'll be drafted next does depend somewhat on who you have now. Just like Vander Esch, Cowboys only had 6 linebackers on the roster, and you need at least one of those for special teams, have to have some size and some speed there.
Looking at the roster, Cowboys have only 1 center, so a guard who can play center also might be of interest. Only two true guards listed, plus Looney at "OL". Even at 3, that's only one starter for each side and one backup. So drafting a guard would not come as any surprise, or an OT to let Collins move back inside.
Other positions like receiver are well stocked, numbers-wise, as is DL, so don't be surprised if the next pick is a need pick, not the bpa...