I would disagree with the 5/6 take, but due to lack of offense I won't argue the value.
Borgen has been worlds better than nearly every other team's 6 D this season. Oleksiak has been a defensive nightmare, roving, pinching and activating at the worst times all season (which is weird because he was outstanding at staying home and providing stable D all season last year). Hakstol moved Borgen up to the second line several weeks ago and he has stepped up and covered for Oleksiak perfectly, solidifying the teams one weak pair. Now the Shultz/Soucy pairing is is the weakest of the three.
Borgen is freakishly quick for his size and one of the best skaters on that Kraken team. He has broken out this year and is a legitimate #4 defensive D in this league.
He's a good passer and has a nice shot, but his stick-handling is bad, so he will never be an offensive threat and it will likely keep him from being a real two-way defender. He does read the ice well though, and makes great pinches and activates at ideal times, so he will be more than just a "black-hole on offense" defensive specialist D.
As far as value, I would gladly move the 2 2nds or Joker and Philly's 2nd for him and smile all the way to the bank