The main problem I have is that if we start Brown/Tatum as the 3/4, we will (need to) start Smart as well to help Walker defensively. So we're playing the same line-up as we did in the playoffs and we're again giving up overall size.
As they say: size matters.
Also our rotation gets a bit whacky if we can't find another solution for the '4'. So we have Walker/Smart/Brown/Tatum/Theis. Our important bench players are: Teague, Pritchard, Langford, Nesmith, G.Williams, Thompson, R.Williams.
Langford is currently injured and if we won't play Thompson regularly at the '4', it means we start a PG + 3 players to play SG-PF + C unit. While our bench provides 2 players to cover for PG (Teague and Pritchard), 2 players to cover for C (Thompson and R.Williams) and also just 2 players to cover for the other 3 positions SG-PF combined (Nesmith and G.Williams)!
That's out of balance, even if you account for Brown and Tatum playing more minutes per game than Walker, Theis (and Smart). We do still have Ojeleye, who will almost automatically be part of the rotation because we'll have minutes to spend at SF and PF. But at the same time Theis, Thompson and R.Williams will be fighting (not literally I hope

) each other to get enough minutes on the team.