The past couple of trades involving disgruntled superstars yielded less than people expected. I'm thinking of Paul George's trade to OKC (at the time people didn't value Oladipo much), or Butler's trade to PHI (Zach Lavine coming off an ACL, Kris Dunn, and the #7 pick). Those trades actually look decent in retrospect, but at the time they looked like a lot to give up.
Point is, I think we're so used to what the Celtics have that we forget how valuable some of their pieces are. Jaylen Brown plus a future Memphis pick alone is a lot, though i'm not sure it's enough for a super-duper-star like Davis. I just don't think one should conclude that Tatum need to be in there to push you over the line.
Zion is a major monkey wrench into this argument. But I wonder if he's actually TOO attractive to trade. People are talking about him like he's a generational talent. And as one poster has put it, he will put "butts in seats" regardless of whether or not he improves wins & losses.
A wildcard in this whole thing... What if NO falls in love with someone picked, say, 2-5? I know there's a dropoff after #1, but that could trump a Celtics package especially if it doesn't include Tatum.