We don't really know if it's a position of strength yet. I would not trade KK. If he even shows a hint of promise that he could potentially develop into a top 4 Dman in the NHL he would be an asset. Plus if D-Petey graduates to the big club, there's room for KK and Mynio. Aside from KK and Mynio, only Willander and Mancari are currently signed for next season. So lots of decisions to be made as far as how to round out the Abbotsford Canucks' D.
I'm not a big fan of trading prospects unless it's determined that the prospect is unlikely to develop into an NHL player. Like this is where management and our scouts have to make the right call. Like Myrenberg doesn't look like he'll amount to much so that's fine. Dorrington might have some potential there so I'm not sure why it's necessary to trade him when we're selling JT Miller. Similarly, why do we have to trade Fernstrom instead of say Ottawa's 4th round pick (Podkolzin trade) if we needed to add more than NY's 1st (which has significant value)?