Very hard to see us pulling off a trade down.
If you think about it, teams will want to move ahead of higher teams who might want the player they want. So, a team trading up to our spot wants to get ahead of the 49ers, Texans, Chargers and Chiefs. It also needs to be a player that the team is sure Miami doesn't want, otherwise they'd try to trade ahead of us. The Chiefs need an RB, so why would we send out signals we'll take Gurley if we want someone to jump ahead of the Chiefs? The Texans would like a WR, yet we're also in the market for one of the top 3 if they fall. Who's going to jump ahead of HOU without wanting to jump ahead of us too?
We arguably don't want QBs, 3-4OLBs, PBS linemen, press-man CBs, TE, SS, and maybe slot WR. The players who are likely to fall to us in that bracket are Gregory, Dupree, Beasley, La'el Collins and Waynes. We might take Gregory and Dupree as 4-3 players, though they're not perfect fits. We arguably could take Collins and we've had Beasley in for a visit and met with him at the Combine. Waynes might be a press corner today, but he doesn't look rooted to the scheme like some others. There's nobody there a team could be sure we don't want.
Plus, right above us is NO, who are definitely in the hunt for 3-4 defensive players. A trade-up team would arguably want to get ahead of them.
The only possibility I see of a trade-up agreement before draft day is that there's a team who wants to move up to have a better shot at one of a few players who might make it to 14. Kind of a hit-and-hope move. On draft day, there's a small chance someone will get past NO who we could shop to the teams in the 20s - but imo it's a small chance.
The Gurley full-court press is to encourage a team to move ahead of us to take him, so someone else drops to us. That's my guess. I think that's a clue we're probably staying put. If it doesn't work out that way, it could mean we try to trade up for whoever the player is, but we lack ammo.