Barring a major move, I think we're stuck with what we've got. The window to revamp the defense was during the offseason. Now, I think the smart move is to keep what we have (minus perhaps Tyutin and/or Prout) and build from within. Keep Johnson and Savard as staples. Focus on maturing the NHL games of Murray, Connauton, and Goloubef. Develop Heatherington, Werenski, Carlsson, and Paliotta.
If everything goes well, I could see Werenski or Goloubef being a longterm partner for Murray. Johnson and Savard will be the "veteran" pairing. Then we'd have a bottom pairing that rotates with Carlsson, Connauton, Heatherington, or Paliotta. We can also continue to draft guys.
The main problem facing this team isn't the play in the defensive zone. Our forwards are doing a MUCH better job of backchecking and breaking out, and Johnson/Savard/Murray/Connauton have been surprisingly good in that department.
Our main problem is a lack of a credible threat from the point. Savard is the closest we have, and he isn't being accurate enough. We need someone who can cruise a la Subban or OEL and get that slapshot through bodies. We're creating the traffic in front. We're doing a good job of getting the puck to the point. Problem is, Johnson misses 100% of the time and Savard's either passing up the opportunity or getting it blocked.