I dont know about other teams, but the Pats released a couple TEs and a RB the other day and brought in 3 TEs. Then today, traded a CB to DAL for a DE. Also today, they traded a late round pick to GB for a DT. Im pretty sure the two trades are players with limited snaps last season due to injury. If the trade logic was based primarily off of production and less off OVR, we could see more of this in the preseason.
Of course, age, contract, and INJ factor in, too.
What's more is the Pats are still working players out. This makes me wish that player ratings were unknown until a player makes a team. Also, that AWR ratings be treated similarly to this new Confidence rating.