Holl at 2m is going to return more than Schenn probably, Holl at 1m certainly is, they probably don't need to retain on him to move him. He's getting a 3rd probably.
Kerfoot at 1.75m, would cost the acquiring team 375k in pro-rated salary if any team cares about that, he's not putting up a ton of points this season but he's probably still returning a 2nd.
Engvall could be someone teams are interested in but chances are they don't end up being able to trade him.

So, maybe they end up with the 1st+2nd+3rd/4th+SDA, again not a bad return if it's just the 1st+SDA if they are trading Klingberg at 100%, but as I said earlier no GM (Dubas) is going to trade 3 roster for players for 1, and Verbeek is just going to retain 30-50% on Klingberg and go get his return in a single trade. Then he'll proceed to try shopping other guys that they may be trying to move, instead of trying to move 3 new guys on top.

When I'm rebuilding I don't take on late in the game "flip assets" as part of the package of someone who was a planned flip. The time doesn't exist to get enough value to make it worthwhile

Sure