I'm with keeping Brown.
Popovich wanted him and the reasons for this were pretty clear in the discussion about the fiba roster.
I think Sabonis is a terrific player, but, he isn't what this particular Celtics team needs now.
I think Brown is exactly what the Celtics need now as he is a defender.
The Celtics are going to score a bazillion points this year and, as Ainge evidenced by going all in on Davis, they just need a frontcourt that offers some defense....some more than they have now.
Subtracting Brown's defense hurts the team more than adding Sabonis' offense would help.