Honestly I think there is going to be a lot more players then the 4 you have listed. I understand we have to put players out on the ice, but if things dont improve, there is going to be some heavy movement off this roster over the next several months.
ROR, Tarasenko are the likely names, IMO Tarasenko stays with St. Louis.
Bortz, Accari, and Barbs will all be in demand.
Deslauries, brought a 3rd back for Anaheim last year, there is no reason to think Accari wouldnt bring back the same.
Barbs would likly bring a 2nd and Bortz 6th or 7th.
Greiss may bring back a late round pick, depending on the goalie landscape at the time of the draft.
Leivo and Pitlick, may, (doubtful) be able to be moved for a 7th, to a team looking to add some bottom 6 depth heading into the playoffs.
Would also think they will try to move some of the players with term, at the TDL or during the off season.
Krug would be at the top of that list along with Saad.
Regardless of who they move, they need to do more then a "re-tool", most of the defense needs to be turned over.