Is Kang really a genius? I don't think so. I just think he has access to technology in the far future.
This is what I mean. If I had access to time travel and decided with the technology I had today to go back to the 16th Century, would I be considered a genius? Well, if you compare me to the people at that time, comparatively, I know more or have better knowledge. Am I a genius or did I just take advantage of the technology that someone else invented to go to a time where people knew less? The Mandarin is on the list because he took an alien artifact written in an alien tongue and figured out FROM NOTHING what it does and use those artifacts properly. That's genius.
If I took a modern television back to the 1940's and used a remote control on it, people would think it was magic. Am I smart in making the channel change? No.