I seriously doubt they traded up for Jones. If they did, they're quite dumb. They likely could've stayed put at #12 and got him. At the very most, they could've traded up to #6 with Philly and locked in getting him for half the cost of jumping to three. If both Fields and Lance fall to Miami at #6, they will easily trade down again and stock up on more picks. As you just stated, Mike, the Lions could be a sleeper team to draft a QB if some of them fall, and that would basically force the Broncos (and the Panthers to a lesser extent) to trade with Miami. Still would be a win/win for Miami as they would gain more picks while still getting aq great player.
In order for both Fields and Lance to fall to #6, things would have to fall sort of like this:
If that were to happen, let's assume the Broncos trade up:
In this scenario, Miami would still be able to land either Smith or Waddle.
Basically the same thing if the Panthers jump to #6 with Lance and Fields on the board. Unless, of course, if the Lions go QB since one of the top four is there. If that were to happen Miami would have their pick of the WRs as it would look like this:
Jones going third and the Falcons passing on a QB would be a dream scenario for Miami, all the more so if the Panthers want to jump to #6 with Miami. There's only one more scenario that would be better for the Phins, but it would be quite crazy:
1) Lawrence (Jags)
2) Wilson (Jets)
3) Jones (49ers)
4) Pitts (Falcons)
5) Sewell (Bengals)
6) Lance (Panthers)
7) Chase (Lions)
At that point, Miami would be out of Pitts, Sewell and Chase. It might seem like all is lost, but it might be a blessing in disguise. Miami could fall back one to #9 and gain an extra 3rd from the Broncos, or they could drop much further to either #17 (Raiders) or #19 (Redskins). They would likely get a 2022 1st and an extra 3rd from moving from #6 to #8 since the Panthers would be desperate in this scenario. But if they then dropped to #17 or #19, they would easy get a 2022 & 2023 1st Rounders from either the Raiders or Redskins. That would see Miami with Picks #18 & #17/#19, which they would still get value for as most of the Edge Rushers should still be available. Additionally, they would like have the following future draft capital: 2022 1st (49ers), 2022 1st (Panthers), 2022 1st (Raiders/Redskins), 2023 1st (Miami), 2023 1st (49ers), 2023 1st (Raiders/Redskins).
Crazy future amount of picks, but a crazy scenario would have to happen.