It’s certainly possible, but as you said, unlikely, but it has a lot to do with having two safeties with restructured contracts already on the roster. Those guys will get close to 100% of the snaps if healthy, because they are both playing on two year practically guaranteed contracts with starter level money. We also have the second highest defensive back payroll in the league, and we already can’t offload any of that payroll to allocate to other needs due to the annual restructuring game.
The DT comparison doesn’t hold up because we rotate a lot at that position. For example, Mathieu played 1,128 defensive snaps while Onyemata played 682, both were healthy all season. We need more talented players to rotate in at DT, the best players at that position will get the most snaps. The two guys we signed were backups on their former teams, it’s prudent to consider other options for upgrades in case they can’t be starters here.
Edit: there’s also this, need to be prepared to pay top dollar if we do trade: