This is simple: This team is definitely missing a second reliable scorer. IT being the single reliable scorer we do have. (presently sitting on the bench with injury)
Now... IT is also our Point Guard...a position that relies on a player to distribute the ball, find open shooters, get others involved, and contribute defensively, all while making the most of his open opportunities. The ball is usually in the point guards hands more than any other player on the team. What this "PG" does with that ball dictates the personality, and chemistry of the offense's ability to score the ball. Even with IT healthy, much of the time our offensive "chemistry" is lacking too much of the time.
When you eliminate IT from the C's lineup, you have a situation dependent on other players, who are mostly inconsistent, to score the ball.
To this point, we have a serious problem. The Celtics have no player that can create his own shot other than IT. When the little guy is absent...we fail to score when the opposing team makes its "usual" 3rd and 4th quarter push.
This team needs a trade, our bigs are at best below average, and soft. And we need this second scorer. Or we can just drift in mediocrity. Or pray we hit a home run in the draft.
The question of, can this second scorer thrive with IT also on the floor, is a different subject entirely.