The Wizards will have 14 players on the roster once the Dwight Howard and Jeff Green signings go through. They’ll only have one spot left on the final roster, which they could use to bring back Ty Lawson, or promote Devin Robinson from a two-way player to a full roster spot.
They could also just leave the roster spot open, as they’ve done in some other years. It would give them flexibility to pull off an unbalanced trade, or bring someone in to help with depth if there are injury issues.