Our offense needs work = Gordon Hayward is missing.
He is our missing offense piece.
The starting lineup is already among the best in the league and isn't too much of an issue offensively. Kyrie is really the only one struggling from the field, and due to the volume of his shots, he brings down the overall efficiency numbers of the starting lineup. I expect his numbers to get back to normal soon.
The bench is what really contributes to the bad offensive numbers. Hayward coming back would only put Morris back on the bench. We've already seen that when Morris is paired with the 2nd unit, the go-to offense is a Morris ISO contested mid-range jumper. That won't be enough to sustain a team offensively.