I think PHI can work out this "whose team is it" potential issue. It is clear that it is Embiid's team. With him, they are a title contender, without him, not so much. When he is available, both Brown and Maxey will work around him. When Embiid is not on the floor, I believe Brown and Maxey will work it out just fine.
Brown is a very smart basketball player and very smart in general. He will figure this out. I don't see this as being the issue for PHI. They will be very good if Embiid is good. If he is out, not so much. They can win regular season games without Embiid, Brown won with less last season, but they can't contend in the playoffs. It is Embiid that puts them over the top.