I'll just bring it down a bit from my pie-in-the-sky idea.
The truth is that even if the Bucks were interested in trading Giannis (unlikely), they probably hang up the phone if Brown is off the table.
The secondary truth is that the Celtics probably don't make a trade for Giannis without clearing one of Tatum, Brown, Smart, or Walker's future salary commitments in the process.
As a fan, I love Jaylen Brown and I don't want to trade him. I think he will continue to get better as an NBA player every year until his late 20s. I think Tatum could get into MVP conversation over the next few years. I don't want to trade him. It's bad form to trade Walker if you talk so much about culture and leadership. Smart is the perfect complimentary piece.
Let's just wait and see if we have a championship-quality team this year. If we do, no trades necessary. If we fall flat, maybe that will show us something about our roster that could help with future team building.