Originally posted by Nephthys
"Can" doesn't mean will. Kas'im was foreshadowing his turnaround on Bane for when he brought out the dual sabers. Before that he say's the Force is the real key to victory.
That doesn't diminish the importance of saber skills. There are also Dooku's own words on this ;
'' It is obvious that this contest cannot be decided by our knowledge of the Force... But by our skills with a lightsaber. ''
Saber always the important one here, you can block a force lightning attack with a saber or you can dodge from force attacks via agility, etc. And that is why Mace can challenge to the Emperor or Yoda while clearly his force powers are not on par with them, or Sidious and Plagueis had to learn high level lightsaber skills despite their opinions on lightsaber combat.