After reading and such I thought footwork was the biggest thing, but neither of my SF's have gained anything in practice even though I devote a decent number (I feel so anyway) to that for them in practice. What other catagoriess) best help improve defense?

Do they have any potential in those categories?

Athleticism, which is improved by Conditioning.

Thanks again man...Made sure everyone on my team had some numbers there.

a, not sure what you mean specifically. I know my team needs much improvement on defense and all advice is welcomed. Already followed courtmagic and added athleticism to not only the SF's, but everyone ...

He means do you have potential left in those categories:  ie: Room for improvement.  If your players were at "Limited' in potential for defense, no matter how many minutes you poured into the category, there wouldn't be much improvement,

both for defense and other skills, you have to take that message about player potential seriously - if a guy is limited at a skill dont spend more than a tiny bit of time on it - he just wont get better

ATH can likely help a guy play defense if his DEF cant be improved

IQ can make a TON of difference so if you are not defending well consider whether you need to spend more on team practice