Originally Posted by HIGH ON PIE 14
Nothing. But there is alot more to lightsaber combat than just swinging it around like a stick. Thats pretty much what Greivous did, but he had four sabers so he could get away with it and still be dangerous. Droids just lack the finesse, and they cant really dodge or do any advanced acrobatics. Also jedi all need the force, and HK being a droid does not have it. I suppose he could be trained to use a lightsaber in theory...but I just don't see it.
Grievous was trained by Dooku and told him that he needed other elements such as fear and surprise to be successful and make up for his zero force potential and he became one of the most successful jedi killers all of time. That said a droid that uses a lightsaber probably cost so much money to build so they can be flexible. Grievous's body guards use those electrostaffs which are similar to using a lightsaber. Then in Jedi Knight Jedi Academy you fight a droid wielding a lightsaber in the training grounds and Katarn said if it was set to Luke's training level than Jaden Korr could have been killed.