Okay, also then, would the more efficient guy perform better or would the less efficient but better primaries guy perform better?
The other thing is that often secondary skills, while not reflected in the team ratings, can be very effective. My personal experience was that even though I was playing with big men with less IS than was maybe typical in my time in IV in particular, because they all had good (7-8 range) handling and passing, they were not prone to turnovers and often one big man would dump it to the other for an easy inside shot. None of that would show up on the team's offensive flow rating, of course, nor does it really contribute to the inside offense rating, but picking up more easy buckets is never a bad thing. The other way to look at it is if you have atrocious handling and passing on a big man, he's likely to turn it over a few times a game against quality opponents. To make up those possessions, you'd either need to increase rebounding significantly to pull down an equivalent number of offensive boards or increase those ball skills to avoid the turnovers. Increasing rebounding on an already heavily-trained big man with bad guard skills is a painful thing salarywise, while the handling and passing are essentially free.
Of course, when you have a 22 year old donkey that's making upwards of 50k/week playing them out of position is also painful, which is why training secondaries early is a good idea.