I'm with the consensus here. You have to go with the line-up that won 16 straight games to start the 2017-18 season. With Baynes already taking over for Morris, I don't think you are losing anything [at all] slotting Brown in for Smart - except maybe depth. Let's not all pretend that Brown hasn't already successfully done this for a whole season before.
Hayward, Morris, Rozier will be the main guys off the bench with game to game spot minutes for Wanamaker, Theis, and Ojeleye. Hopefully Smart comes back healthy soon!