So it's based on salary?
That's one theory. That's not exactly what I would say, though.
So my 74K Superstar PG/SF should have no problem training his inside game?
It depends, has he had training since the season started? If so, you need to get a salary estimator to see an approximation of his current salary.
If he has had no training since the start of the season, I would say he still has lots of room to improve. So you should have no problems with the skill cap. However, age and height might make things slower than you would like.
Run of the Mill Canadian Manager