If Kyrie want to return and a stipulation is that brown goes then as much as I love brown...you trade him.
Team is in dire need of a center that can let horford slide to the pf spot. I am sure that a combination of brown, yabusele a pick or 2 can net that center.
Maybe brown plus can net you one of
Turner
Bamba
Capela
Ayton
Sabonis
Irving
Hayward
Tatum
Horford
Turner/bamba
Hell of a lineup
If Brown was a have to go for Kyrie to return, Capella makes the most sense. Brown, Williams and Ojeleye works in the trade machine. I don't believe we could get any of the other 4. I am not sure I am willing to give up Brown though to keep Kyrie here and I want Kyrie here but with Brown and Tatum staying as well. Here is hoping he would not demand Brown a have to go for his return.