When it comes to the FG %:
My former PF was 26-37 (70%), with 4-7 3pt. He was inept IS with respectable JS and low JR.
My shooting guard is 14-36 (39%) with 2-12 3pt. He is strong JS and JR, with respectable IS.
Looking at my current players, he is the 2nd worse at FG % and 3rd worse at 3pt %, even though at shooting alone he is straight up the best player I have.
Backcourt players always have worse FG% than front court players. Long jumpers and 3 point shots are more difficult to make, and don't convert at nearly the same rates. Check the FG% leaders in the NBA. They are inside players. So in that case, BB is modeling the world pretty well.
As far as Juterborg, he's taken 13 3FG attempts, and gotten perhaps a bit unlucky that only 2 went in. But 13 observations is not a useful statistical sample. And it's not just his JS and JR that affect his FG%, but also his driving, inside shot, and passing. His passing looks good, judging from his assist totals. But the others will affect his exact percentage. Really, on a guy who's 8 JS, 39% FG% is pretty decent.
The player rating overall I guess it's somewhat consistent, what really isn't is the scoring/defending rating with the PP100.
Looking at this (I'm the right side):
inept (medium) Outside Scoring inept (medium)
inept (medium) Inside Scoring pitiful (high)
pitiful (medium) Perimeter Defense inept (medium)
pitiful (high) Inside Defense inept (low)
My C and PF had the most PP100. Yet my inside scoring is considerably lower than outside scoring, and their inside defense is better than outside defense.
When I saw this, I quickly realized that the statistics this game provides are not to be trusted, and therefore I was disappointed I can't make up tactics based on it because this feature is completly broken and makes no sense.
Well, part of this is reflected in the difference in FG% inherent between inside and outside shots. So that's affecting your C and PF and center's PP100 values. Inside guys almost always will have a higher PP100 than their backcourt teammates. And their inside defense isn't higher than their perimeter defense (a step from pitiful(med) to pitiful(high) is very small).
Finally, there's a way that his lower perimeter defense can boost your inside guys' PP100, and that's because of uncontested shots. A uncontested shot is one that if it is converted, becomes an assist for whoever made the pass. And when your backcourt players have the ball and are trying to pass, they are competing against the defender's OD. So, a low perimeter defense for your opponent makes it
easier for your guards to pass to your inside players, and lets them make easy dunks and layups.
Note that this effect of uncontested shots doesn't appear in the team inside scoring rating. That value is controlled just by the skills of your bigs.
It's also useful to note that the team ratings are a reflection of the skills of your players at various positions, but they don't tell the entire story. They don't reflect the importance of secondary skills on players (such as passing on big men, or inside shot on guards). And they don't really reflect the player by player matchups, or the effects of subsitution patterns. So they are useful, but there's no completely deterministic relationship between team ratings and PP100.