Gordon seems to me to be on a similar trajectory as when he was with the Celtics. He is the primary option now so getting more opportunities but he is still very much up and down from game to game.
This season, his total points per game are: 28, 12, 28, 11, 14, 20, 18, 44, 26, 13, 34; up and down. To me, those are not all star numbers, not, "best player on a playoff team" numbers, and not $30m per year numbers. Still, 22.5 ppg on 16.6 shots per game in 34.8 minutes is very good and very efficient.
I looked back on 2016-17 (his last and best with Utah), definitely more consistency or at least more runs of good games strung together with still some down games mixed in. Overall, about 22 pts on 16 shots.
I think we are seeing exactly what Gordon Hayward is post injury and really has always been. He probably would have continued to trend up at a much higher rate without the injury. He might have become a "star", he was headed in that direction. This will never be known.