I have been saying Giannis or bust, in fact, I may have started that, but when I say it, I mean it in the context of if we are going to trade Brown, my top choice is to get Giannis. There are a bunch of other Brown trade ideas/possibilities, maybe even a couple of others that I would consider, but the idea of Just Keeping Jaylen Brown, is a perfectly good option also.
To consider this in terms of all possible off season targets, that may or may not involve trading Brown, I guess yes, Giannis would be at the top of my list of those that have a realistic possibility of being moved. In a down year, on a bad team, playing with supposed injuries, he somehow managed to put up 28/10/5 with 62%/33%/67% shooting percentages. Like to see the FT% up some, but those are his numbers in a season he was allegedly hampered by injuries (I am guessing not his favorite season). The guy is still a stud and I believe will cotinine to be for at least 3 seasons (when he will be only 34 at the start), and then pretty darned good for a few more seasons after that. Ongoing durability is a concern with Giannis, a lot of his game is based on athleticism, but so isn't Brown's. That risk is just part of the cost of doing business.