Ok, thank you for everything....I am also sure that JS and JR are very important, especialy they have influence on FG %...OK, we have same viem on that ;)
About big men: It's normal that IS and ID are better...of course RB is important, and SB is the last. So, I would put these skills so:
Primary:IS+ID(50% - 50%)
Secondary:RB(more=better)
Tertiary:SB(the last, and not so important skill, only addition to ID(let's say that opponents player scores a few baskets less, if you have high SB)
On other skills(JS,PS,HN,DR) I prefer PS and maybe DR. Let me explain: I have PF who has 4.4 APG and his passing is "only" mediocre(5). And we know that good passing leads to easy scoring...ok about DR - this is, in small amounts, important skill for PF, beacuse C never drives on basket(I guess that for dunking and laying ups play needs IS, nor DR)
And last, if you have too much money, you can buy a PF/C with JS. But, I would spend my money on a C with higher IS and ID ;)