What StreetHawk said. The Steelers are currently projected to get a 4th for the contract Fields signing with the Jets, but it could turn into a 3rd if Fields maxes out snaps and his incentives. Similarly, Wilson's 10.5m deal is currently projected as a 5th, but could hit a 3rd if Wilson maxes out snap count and his incentives (which would bring the deal to 21m).
Not that a comp pick isn't quite possibly on the table for Pickens, and if he behaves and doesn't get injured it'll probably be a 3rd, but 3.6m isn't where that line starts. Nowhere close.
And, ngl, I will be laughing long and hard if he goes full Diontae and there's no comp pick at all.