Bro, most of those numbers I posted WERE guys in their D+3 years. A couple of them were D+2 years.
Petersson put up those stats in his D+1.
Nilsson, Forsberg, and Zetterberg played SHL hockey *decades* ago.
Sedin played decades ago and certainly didn't play SHL hockey in his D+3.
Runblad like you said is kind of an anomaly, and played a different position.
Lindblom is a good recent comparable, and probably in the ballpark of what I'd expect Berggren to develop into (in terms of impact, not style).
I posted a list of almost all the good Swedish forwards playing NHL hockey right now, and very few of them played SHL hockey during their D+3 season. I think that William Karlsson and Jakub Silfverberg did, so there would be two good NHLers that Berggren did in fact outproduce.
My point is that not a ton of good NHLers play D+3 hockey in Sweden. Nilsson, Zetterberg, and Forsberg did many years ago. I think it should be pretty apparent that Berggren doesn't bring what guys like Zetterberg or Forsberg brought to the table.
In recent years William Karlsson, Jakub Silfverberg, and Oskar Lindblom did. Good players, if Berggren can develop similarly that would be good for us. But my point is that there isn't a long list of good NHLers competing with Berggren on that stat.