Here's the interesting stat when it comes to the 5 man units when Davion or Keon plays with the starters:
Davion: -12.7 net rating
Keon: +9.5 net rating
However, a lineup of Lyles, Davion, Monk, Sabonis, and Keegan have a +22.1 net rating. That said, while that unit has played nearly twice as many games as the starters with Keon, it has also played nearly 30 less minutes as well on the season as well. Strange patterns from Brown is the likely culprit but that's just strange.