I don't know how many agree or disagree with this, but I don't get the talk of Skjei struggling last season. I thought he was right about what you'd expect. He had a good season. He was playing a bigger role than he's capable of when McDonagh got traded, and he consequently played worse. I didn't think he had a bad season though.
I thought he was actually better last season than the season prior. He defended like a competent top 4 defensemen last season. The season prior, he scored a lot of points from secondary assists and played pretty bad defense. I thought he didn't have as good of a rookie season as some thought.
I think the issue is expecting Skjei to be a consistent 35-40 point guy or trying to compare him to McDonagh. He's a solid second pairing defensive defensemen who isn't terrible offensively, but he's not a big offensive guy, not a PP guy, and he's not a shutdown defensemen, despite being above-average defensively.