Bring in a young player who can play top-4 minutes. This team is blessed by having Staal and McDonagh on the left side. Stralman and Staal have very good chemistry. That is a solid 1b pairing. Get a player who can pair with McDonagh on a 2nd pairing or another 1b pairing and they will be fine.
Another way to think about it is that if they can get a a d-man who can move the puck both skating and passing maybe they spend less time in their own end because they are on offense more.
Moore is also a very solid #5 who can play more minutes when necessary.
Yeah, but then we don't need Moore AND MDZ. It's a waste of assets and cap space.