All 32 teams aren't drafting DT or Edge though are they? There are other great players.
Again, there are only two or three non-defensive front players I would take over the likely options at 16.
I'm not going to take a QB, RB, TE, ILB, or S at 16.
That leaves WR, OL, DT, EDGE, and CB.
There is only 1 WR at 16 and that is Matthew Golden...and I am still 50/50 there.
There is pretty much only 1 OL I am taking at 16, Membou. (Maybe Will Campbell)
There is only 1 CB I am taking at 16 and that is Will Johnson.
I have more DT and EDGE that I prefer at 16 than all other positions combined. IMO, that is just how the draft class is looking to shake out at 16.