We play small because our best players are small. Brown is working his way into more minutes but aside from Brown we're small at the wing. Stevens plays a ball handler, wings/swing, Biggs.
Our worst lineup
Ball handler = IT 5'9
Wing = Bradley 6'2
Swing = Smart 6'4
Swing = Crowder 6'6
Big = Horford 6'10
Those are our best players but they're too short.
The biggest we can play is this
Ball handler = Smart 6'4
Wing =Brown 6'7
Swing = Jerebko 6'10
Big = KO 7'
Big =Horford 6'10
This puts Jerbeko at SF and keeps or two best players on the bench, so it's not ideal. Also, we are actually playing 3 biggs and Stevens only wants to play 2 biggs.
At 6'6 Crowder shouldn't be at the 4, but he's a better player than KO and Jerebko so he needs to play, right?
What we need is for Crowder and IT to go to the bench and replace them with bigger players, who are actully better. That's not possible this year, but it might be next year. Come playoffs next year we could be much bigger.
Ball handler = Ball/Fultz 6'6/6'5
Wing = Brown 6'7
Swing = Hayward 6'8
Big = Horford 6'10
Big = Zizic 7'
This lets us run pretty much this year's starts as the bench next year. If we draft Ayton or Bamba in 2018 that's a skilled 7 footer so we could be even bigger.