When I'm buying outside players, the JS-JR gap is my main criterion next to OD. I never buy players with JS = JR, or JS < JR. JR is boosting the salary and in no case is needed to be above 17.
However, my players' stats show:
1. 15-12
22.7 mpg, 13.5 pts, FG% 0.44, 3p% 0.45
2. 16-13
26.6, 17.2, 0.48, 0.28 (probably because of subskills, which make the difference >3)
3. 14-11
23.5, 12.7, 0.48, 0.33
4. 13-10
22.1, 10.2, 0.45, 0.31
5. 12-10
25.8, 14.1, 0.46, 0.34
These are pretty good numbers, 0.49 and 0.34 on the team level (all players included).