Because I already answered it. When your 1st line centre is on pace for 46 goals and he's replacing your 1st line centre from last season that had 3, I think you're going to see improvements on offense. Boeser and Pettersson completely change the landscape because they are giving us an 80 goal pace between them. Replacing the top line where we were getting around 30 between the twins is going to have huge impact on your goals for and goal differential - the greatest indicator of team strength. This change will not be reflected in his stats.
Under no circumstances should we be buying. I would move Sutter and Gudbranson for picks and aim to go into the draft with a dozen picks.
If you can think someone can sustain a 27.6% shooting percentage, that says a lot.
By the way, Boeser is on pace for 30 goals (in 69 games, because we have 28 games remaining), and Petterson is on pace for 39, which gives us roughly 70. Combining this perfect pace with all the other players gives us 225, just a mere 7 more goals . I think I have something here. By the way, he also are on pace for 254 GA, which gives us a -29 goal differential. Improvement? Barely. Main difference? Markstrom is doing miracles on ice in some games.
About the buyers/sellers stuff, one could argue that if someone sees a large improvement on the team, you try to give that team some support and get some additional pieces to make that push. If you say that we should be sellers, and I agree for a completely different reason, I must conclude that you don't really believe in your answer.