There is serious downside to RFA, it can be for a 2+1 or a 3+1 (if the C's submit a maximum qualifying offer)
Or even worse, he takes the qualifying offer and walks as a UFA the next year.
In all honesty this is the most likely scenario. The Celtics will make a low-ball extension offer, which Brown (having undoubtedly been tampered with) will decline and head to free-agency where he'll get market value on a team that has cap-space and the opportunity for him to play.
Why is this the most likely outcome?
There has been no reports of Jaylen not liking being in Boston or Boston not valuing Brown extremely high and or Boston not willing to give Brown max money.
The most likely scenario is Jaylen signs a 4 or 5 year deal with Boston next offseason. What that contract is worth? I don't know. It is going to depend on what Brown does this season. But I have no doubt that Ainge and Brown will come together on a figure that keeps Brown here for many years.
That's not a sure thing.
You will be right if Brown plays well and ends up having a great season.
But if Brown is just a 14 to 15 points per game guy this coming season, Ainge might trade Brown on or before the trade deadline.
Why I keep saying the Celts might trade Brown?
Answer: Romeo Langford
Celts picking Langford was very unusual.
With Brown, Hayward, and Smart all going to get minutes at SG, why pick another SG with your lottery pick?
That's why I don't think it's a sure thing that Jaylen Brown will be Celtic for many years to come.
Celts had a lot of options at #14.
But they went with a SG.
So that tells us a lot about how the Celts feel about their SG situation.