I'd like to see the Celtics fill out the roster with veteran role players, assuming that there's no opportunity for "fireworks". Let's see how the group responds with a hierarchy of Hayward, Tatum, and Brown as the primary scorers. The supporting cast should consist of knockdown shooters and versatile defenders. Hopefully Hayward can regain his Utah form, while Tatum and Brown can develop without the fear of stepping on the toes of other teammates.
More than anything, Tatum's development is crucial to the future direction of this franchise.