So I was rewatching The Savage Curtain, and it reminded me of some canonical issues that need to get excused for that episode. Namely Kahless, who is shown to look exactly like a 23rd century, TOS Klingon and is said to be evil and to be the originator of the Klingons' evil ways. Obviously when this episode was made in the 60s, that was purely the intent. After the Klingons had been revised, the excuse is that it is how Kirk and Spock envision Kahless. One of the things that is harder to explain is the false Kahless having the ability to perfectly mimic voices. This was nowhere mentioned in any of the later episodes, and so far as I know it does not seem to be explained or brought up anywhere else. One explanation would be the image of Kahless was given that ability by the Excalbians, but that doesn't make sense. This Kahless, if he comes from Kirk's and Spock's head, has to come from some idea that Kahless was capable of that. And the idea may come from Federation propaganda which was totally invented or at least an exaggeration. Or it may have been something real. So any thoughts on the explanation?