That +2 Jr matters a lot.
I remember 2 years ago in my U21 squad I had a very good player with approx. 14-15 Js + 9 JR, and he was a relatively bad shooter. Once we achieved during the season his Jr 11, he suddenly improved a lot in terms of efficiency and offensive potential. That 2 JR were a huge boost.
Also secondaries and in which position you are putting him in which tactic.
On the other hand I think it is not that easy and really depends on your league.
I have a guy with JS 16 + Jr 15 and IS 10. Currently I`m in the II. div in our league (and obviously different Div II are also vary, one can be relatively weak like others strong) all in all he has been doing 51% 2 points and "only 38%" three point.
I`m pretty sure in my current league the average OD is around 15-16, only a few (top 1-2 teams) might have higher.
If you also taking into account that fact based on the game engine the most efficient set up would be JS=Jr, and DR should be higher then your offensive skills, which in my case almost perfect, I would not say that he is that outstanding. I mean he is very good, and he is not the best player in my team so when I play patient not he is the go to guy, but those %-s are not that super good.
Again there are lots of factors to look at the same time.
Was your player a dominant player in the roster (I would say yes) or a well trained good player but in between other 2-3 similar players?
Sz.