The problem with the Jeff green comparison is that for most or all of last season, jaylen showed two key abilities that green never has for a consistent stretch of time:
1) Versatile, high level defense
2) Above average three point shooting at a decent volume
Yes, his scoring and assertiveness is inconsistent, much like green, and his on court demeanor seems similar.
However, what prevented green from being a better than average player was not the inconsistent scoring per se but his inability to distinguish himself and provide value when he wasn't scoring a bunch. Green also never supplemented his scoring with volume outside shooting or frequent trips to the free throw line.
Jaylen needs to get his jumper back and learn to assert himself in other areas when he isn't getting a ton of offensive touches in his comfort zones.
I don't know if we can expect jaylen to ever change his mental or emotional approach to the game. I doubt he'll ever become a guy who generates five free throws a game.
However, it doesn't seem likely to me that his jumpshot last year was a total fluke.