That interesting... I am of the opinion that when you are competing in higher leagues, the secondary skills become increasingly important as they can become exposed more easily. For example, a C/PF with poor OD and poor passing, handling seems to be more foul and turnover prone.
For example, on Satuday, I played
(22917). He's got a 109k center, but I theorized (with the advice of another team who beat him earlier in the season,) that Princeton or an Outside oriented offense could get him in foul trouble. Lo and behold, he picked up two quickies in the first, and a third midway throught the second. Now, that being said, he didn't pick up any more in the second half (coaching adjustments in the GE, I imagine).
All that to say - do secondary skills play a more important role in higher leagues, and if this is in fact true, would it not make sense to train your bigs secondary skills (or your guards inside skills, we all know how irritating it is for those guards to miss open layups...)? Wouldn't the recent change of being able to individually assign players defensive positions support and encourage secondary skill training? After all, I can play my 7 footer at PG on offense to get training minutes but drop him to the PF/C position on defense.