I looked at and posted the numbers with and without Barzal in the lineup (when he was out extended periods of time) and the stats didn't back this up. The team was better in most categories without him if I recall correctly. Here it is again in case you wanted to look at it:
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As I mentioned in the posted I originally supplied that data: I am not a math wiz and was at work being interrupted while looking at some of the data so there could definitely be errors.
I'm not advocating for or against a deal involving the two players, but against this narrative that the team is so much better when he's playing than without. He's a very flawed player, like a few of us have been saying for quite some time, and a select few refuse to acknowledge it (not you).
I haven't looked at any of the Petterson numbers, other than what you provided, but my hesitation with acquiring a player like that is that he seems to be a bit mentally soft. Whether that's a fair judgement or not for me to make I don't know, given we don't know what exactly the dynamic is in that locker room. That said, you need to get talent in order to compete so finding a way to bring in more is always welcome and his age fits better than Miller for this team.
Just one note on the advanced stats, we've been looking at expected this and expected that for a decent chunk of time now but the expectations have rarely ever come to fruition. I think it's useful to tell part of the story but if the expectations never meet reality they're not nearly that important.