I've sort of echoed the same sentiment as the OP on this issue (and received my fair share of criticism as well).
I think the BIG ISSUE people are missing here is that the prices for PG13 or Butler are just downright ridiculous. First off, I think PG13 is untouchable. They are the 6 seed in the East (yeah, maybe it's mediocre), but Bird hasn't even offered the slightest hint he will shop PG13. You can try in the summer, but won't happen by February 23.
As for Butler, the Bulls say they plan to keep him but will trade him for a godfather package if offered.
So let me ask you all, would you make this trade?
2017 Nets Pick, Zeller (For Salary), a random Second Rounder, then choose 3 of the following: Smart, Brown, Bradley, Crowder, 2018 Nets Pick.
Is he worth that? And even if he is, are you truly improving this team to the point where they are better than CLE or GSW?
Yeah, Butler is better than anyone mentioned, but would he really improve the team that much if Crowder and Bradley leave, or Smart and Bradley? I doubt it.
Try again in the summer and hope the Bulls lower their asking price a bit, sort of like how in baseball, Chris Sale looked untouchable, then the White Sox chose a direction, and Boston got him for a surprisingly fair price.