Ok - but are those teams able to attract free agent talent?
Likely because good players do their time with bad teams then go to good teams. Is it because the bad teams draft poorly in the top 10?
Trading down from the closest thing to a sure thing in the draft for magic beans would be Suggs/Pace-Johnson two dimes for a quarter type move. Pace was a nice player, but half the player of Suggs, and Johnson was just a guy.
Teams don't win super bowls without stars. Our most realistic path to getting/maintaining stars is through the draft.
Free agency is great, but a team still has to hit on the draft because FA is typically overbloated contracts for the stars.
They could draft poorly in top 10, but yes, a guy like Anderson could totally be on another team in a few years because we failed to rebuild and one elite player wasn't enough. That's a story told 100 times before.
There's no 100% guarantees in the NFL. Not Bosa, not Anderson. The Suggs trade gets brought up, sure, but he was a #10 pick.
I'm sure the inverse also exists, a team trades down and picks up a couple/several players that also works out for the team.