You need elite players to win a championship. Trading away an Allstar for inferior players puts the C’s father away from that goal.
I pretty much agree with this, and so in general I think that if you're trading away Brown for a non All-Star, I think you're also talking about trading Tatum too and starting over. At the same time, Cam Reddish puts up a few nights a month where he looks like a future All-Star, and if he can put it together consistently (and I get that "if" is doing a lot of work in this statement), he could be an All-Star in a couple of seasons. And Reddish isn't even the top prize in the deal -- that's John Collins and Kevin Huerter.
It's a neat concept, and I could see either side saying yes or no. I do think the C's defense could be in real danger of tanking, losing two of our best three defenders, and the biggest risk the C's face is contract uncertainty, with Reddish and Hunter due extensions next season in advance of what could be a crazy free agency summer. Celtics would also have even more need of finding a PG in the summer. It's one of the few proposals I've seen where I like every player coming in and going out, and can see plusses and minuses for both teams. TP to the OP for creativity.