I remember watching pre-game on ESPN/ABC before the C's played the Pel's, Woj was talking about having talked to several GM's about who they would start a franchise around with the players in this game - i.e. Tatum, Zion, Brown, Ingram, etc. and Woj said that several people he talked to said they would go with Brown.
Back in January, on The Jump, Brian Windhorst (who I know isn't the end all be all), when speaking about Brown, said:
"“He’s on the most improved player ballet, he’s on the All-Star ballet, he’s on the All-NBA Ballet. I gotta be honest with you, there’s only 3-4 players in this league I would trade Jaylen Brown for, and the contract that he signed, while it is a $100 million dollar contract, is well less than the max making the Celtics thrilled that they got him on that deal. He’s arguably one of the most valued dollar for dollar players in the league right now.”
Again, I realize that is one analyst's opinion, and we don't know how many GM's Woj actually spoke to, but I think Brown is highly thought of throughout the league and is viewed as one of the best assets, based on age, skill, development and salary. IMO, I don't think there are too many GM's that would trade Brown for Fox, including our own.