When you look closely at it, Brown was pretty darn good when he was counted on to score in the playoffs last year. He and Tatum were counted on to carry a good sized load and both did a nice job of it. (Because everyone else was injured.)
Now we get back the 2 players from injury. Both players are veteran NBA scorers who have had the benefit of years in the league. We now tell the kids to be complementary players while playing beside these same 2 veteran scorers.
Both kids have never been just complementary players in their entire basketball lives. Not in high school or college. Both are too respectful to step on anyone's toes, and that may be the problem.