Ryan Murray was once one of the highest leverage LHD in the league and put up solid defensive metrics while doing so. Maybe doesn't have the offense you'd want for a former 2nd overall but a strong 2nd pair shutdown guy who can face opposing 1st lines would be considered an above average outcome for Broberg and the absolute best possible outcome for Niemelainen. Don't lump him in with Kris Russell, he's better than all our non-Nurse dmen if he's 100% healthy.
Also you guys greatly overrated the necessity to develop Niems. His ceiling in this league is a properly utilized version of Gudbranson/Ristolainen/Chiarot/Larsson etc, a good physical bottom pair dman who can add energy against opposing bottom 6 forwards but gets caved in possession wise against top 6 forwards due to lack of puck skills/puck movement. You pay these guys slightly above league minimum, put them into the lineup against big strong teams that don't have much elite offensive skill, take them out vs softer skill based teams, let them throw their weight around, and cut bait in 3-5 years and let some other team hand them a 4 million dollars brinks truck to get themselves fodderized in a top 4 role.