Shadbala

What you said in Shadabala course is so true, that if Mercury is bad in Sthanabala, then that person will have hard time putting their skills to use, and they can have lots of skills, but they will still have hard time putting it to use. And I was thinking that that is so true, and how is it that they can still have lots of skills, while that planet is bad in Sthanabala, because Sthanabala considers planets Uchabala and other factors, like it being in Kendras and Trines. So, how can we still have lot of ability (skills) with that planet, if it's bad in Sthanabala. That's what I didn't get, thanks.