Originally posted by General G
If we are only counting ROTS, then we would not know that Grievous can use lightsabers, yes he shows everyone his collection of lightsaber, but that might all they could be, is a collection. Jango Fett killed many jedi, does that mean that he can use a lightsaber? Nope. The Clone Wars series showed himm with the lightsabers, but that is not 100% canon, so people might have guessed or assumed it was just for show or for some poeple who might not have even watched them.And I agree with you that he was probabky trying to keep the CIS in order as well as not wanting to piss of Sidious.
Starwars.com had something about the Creation of Greivous or something that mentioned that he would be lethal with a lightsaber. And you make it seem like only Jedi/Sith can wield a lightsaber.