What you see may not always be what's right.
A lot of Rangers fans were obsessed with MDZ's rookie season. The truth is that, he was playing very average even strength and rode a hot powerplay in the beginning of the year to stat pad. He didn't have a great rookie year as indicated, but a ton of us fans were too biased to admit it.
Myers won the rookie of the year, he became a #1 guy immediately on a playoff team. Pietrangelo had a dominant rookie year, his defensive was on par with the league's best towards the end of the year.
Larsson will probably get 20-25ish points, I doubt he's gonna have a better rookie year than the players mentioned above. Larsson won't contend with the rookie of the year award like the other two were, unless he gets on a hot point streak. There are also other rookies playing out of their mind right now, Nugent-Hopkins PPG player, Landeskog top 3 in shots, hits, Couturier is starting to heat up, etc.
Enstrom while it's a great accomplishment that he became 'the top defender in his division', it certainly is debatable. Mike Green also had a ton of points, playing in all situations for a playoff Capitals team. Other than that yeah, but who were the other elite defenders in the division,.... Frankstiek Kaberle?